Category: Ponds

Ask most people why the fish in their backyard pond died and they will blame a disease. Nine times out of ten it was not a bug at all. It was the water. Get the water right and healthy fish largely look after themselves, so that is where a beginner should put nearly all their attention.

Here is what actually keeps koi and goldfish alive and well in an Australian backyard: enough water, enough oxygen, a filter that has had time to mature, sensible feeding, and a bit of protection from summer heat and hungry birds. Work through those in order and you will dodge the mistakes that catch nearly everyone starting out.

Give them more water than you think they need

Fish are far more forgiving in a big body of water than a small one, because a larger volume dilutes waste and holds a steadier temperature. A tiny ornamental pond heats up fast on a hot day and crashes cold on a still night, and those swings stress fish badly.

As a rough guide rather than a hard rule, keep your stocking light. Beginners almost always want too many fish too soon, and an overstocked pond is the most common reason water goes bad. Koi in particular grow big and live for decades, so a handful of little ones today can become a serious load in a couple of years. Depth helps too: a deeper section gives fish somewhere cooler in a heatwave and steadier through winter. If you are still planning, our step-by-step guide to building a garden pond covers sizing and depth before you dig.

Oxygen: the thing beginners forget

Fish breathe dissolved oxygen, and warm water holds a lot less of it than cool water, which is why gasping at the surface on a hot, still morning is such a common panic. The fix is movement. Anything that breaks the surface, a small fountain, a waterfall, or an air pump with an airstone, pulls oxygen into the water.

A few things worth knowing about aeration:

• Run it through the night in summer: plants and algae consume oxygen after dark, so the lowest oxygen of the day is usually just before dawn.
• Surface agitation beats depth: gas exchange happens where water meets air, so a gentle ripple across the top does more than a jet firing into the deep.
• Get the power done properly: any pump or aerator wired to a fixed outdoor power point must be connected by a licensed electrician. Plug-in and low-voltage solar kits are fine to set up yourself, but mains work is not a DIY job.

The nitrogen cycle, in plain English

This is the bit that quietly kills more fish than anything else. Fish produce ammonia through their waste and gills, and ammonia is toxic. In a healthy pond, colonies of beneficial bacteria living in your filter convert that ammonia into nitrite (still toxic) and then into nitrate (far less harmful, and taken up by plants).

The catch is that a brand new pond has none of those bacteria yet. Fill a pond on Saturday and drop fish in on Sunday, and the ammonia has nowhere to go. Let a new pond run for several weeks so the filter can mature before you add stock, add fish slowly, and pick up a simple water test kit so you are reading the water rather than guessing. The filter is the engine room of the whole thing, so it is worth getting right. Our guide to pond filtration and UV clarifiers covers how to match one to your pond.

Feed less, and never in the cold

Overfeeding is the fast track to green, smelly water, because uneaten food rots and spikes ammonia. The old rule holds up: only give them what they will clean up in a couple of minutes, and once a day is plenty for most backyard ponds. Fish are cold-blooded too, so as the water cools through autumn their metabolism slows right down and they can barely digest. Once it is genuinely cold, ease off and then stop feeding over winter, or you are just leaving rotting food in a pond that can least handle it.

Surviving an Australian summer

Heat is the big seasonal risk. Hot water holds less oxygen, evaporates faster, and pushes fish to their limits. A few sensible moves take the sting out of it:

• Throw some shade: floating plants like water lilies, or a shade sail over part of the pond, keep the water cooler and give fish somewhere to hide.
• Top up gently: evaporation concentrates everything in the water, so keep the level up, and if you top up with town water let it stand or treat it for chlorine first.
• Beat the birds: herons, kookaburras and the neighbour’s cat all fancy a feed, so a deeper zone, overhanging plants or netting gives fish a fighting chance.

Reading the warning signs

Fish tell you when something is off, usually well before it turns into a disaster. Watch for gasping at the surface, fins clamped tight against the body, flashing (rubbing against rocks), or fish going off their food and sitting listless on the bottom. The first response is nearly always the same: test the water and improve the oxygen. A partial water change and more aeration fixes a surprising number of problems.

If fish stay sick after you have sorted the water, or you are seeing sores, ulcers or clear signs of parasites, get proper advice rather than throwing random medications at the pond. An aquatic vet or a specialist aquarium supplier can identify what you are dealing with and dose it correctly. Guessing at treatments does more harm than good.

Plenty of water, steady oxygen, a mature filter, restrained feeding and a little seasonal common sense will carry a backyard pond full of healthy fish for years. For the bigger picture on pumps, ponds and water features around the garden, start with our complete guide to water in the Australian garden.

Answer first: green, cloudy pond water almost always comes down to filtration that isn’t keeping up with the muck and nutrients in the water. Get three things working together, mechanical filtration, biological filtration and, when algae is the culprit, a UV clarifier, and most backyard ponds clear up and stay that way. Here’s how the pieces fit, sized to your pond and the fish in it, without any guesswork about wattage or flow rates you don’t need.

Why pond water turns green

Green water is a bloom of single-celled algae, and it feeds on two things: sunlight and nutrients. The nutrients come from fish waste, uneaten food and leaves breaking down on the bottom. As that organic matter rots it releases ammonia, which is toxic to fish. Helpful bacteria convert the ammonia into nitrite, then into nitrate, which plants and algae then lap up. That chain is the nitrogen cycle, and it is the engine room of every healthy pond.

So a green pond usually means one of two things: too many nutrients going in, or not enough biological filtration to process them. Balance that out and you starve the algae of what it lives on.

Mechanical vs biological filtration

These two do completely different jobs, and a good filter setup runs both.

• Mechanical filtration: traps the physical gunk, leaves, fish waste and sludge, on foam pads, brushes or a fine screen. This is the part you rinse out regularly.
• Biological filtration: gives those helpful bacteria somewhere to live. Porous media like bio-balls, ceramic rings or filter matting has a huge surface area, and the bacteria colonising it are what quietly turn toxic ammonia into far safer nitrate.

Mechanical media you clean often. Biological media you leave well alone as much as you can, because scrubbing it hard kills off the colony you spent weeks growing. A gentle swirl in a bucket of pond water is plenty.

What a UV clarifier does, and what it doesn’t

A UV clarifier is a sealed tube with an ultraviolet globe inside. Pond water pumped past the globe cops a dose of UV light, which clumps the free-floating algae together so your mechanical filter can finally catch it. Run it for a week or two and pea-soup water usually turns clear.

Here is the catch. A UV clarifier only deals with the green algae floating in the water. It does nothing for the stringy algae clinging to your rocks, and it is not a filter on its own: it only works with water flowing through it and a filter downstream to trap what it clumps together. It also won’t fix the underlying nutrient problem, so pair it with proper biological filtration rather than leaning on it alone. If you want to look at the buying options, a compact unit like a Pond One Cleartech UV steriliser suits a typical backyard pond, and it still needs a pump to push water through it. (As an Amazon Associate we earn from qualifying purchases.)

Matching filter and pump to pond size and fish load

The honest answer is that bigger is safer than smaller. A filter rated for a larger pond than yours will still cope on a hot day when the fish are active and the water is working hardest. Undersize it and you will be forever chasing green water.

Two things drive the sizing:

• Pond volume: roughly how many litres of water you are holding.
• Fish load: a pond stocked with koi produces far more waste than a couple of goldfish, so it needs more filtration for the same volume.

The pump is what ties it all together, because it has to move enough water through both the filter and the UV unit to actually turn the pond over. A reliable submersible unit such as a Platypus pond and fountain pump sits down in the pond and pushes the water up to the filter. Match the pump to the filter’s needs and the UV globe’s flow window, rather than grabbing the biggest one on the shelf.

Flow, plumbing and placement basics

Keep the plumbing short and simple. Every extra bend and metre of hose robs you of flow. Sit the filter slightly above the water line where you can, so it drains back cleanly, and keep the UV unit out of direct sun so the housing doesn’t cook in the afternoon.

One thing that is not a DIY job: the power. Any pond pump or UV clarifier has to run off an outdoor power point on an RCD-protected circuit, and that connection is work for a licensed electrician. Water and electricity sitting next to each other is exactly where you don’t cut corners.

Seasonal cleaning and keeping it running

A pond filter is a living thing, so treat it like one.

• Weekly in summer: rinse the mechanical pads and check the pump inlet isn’t blocked.
• Every month or so: wipe over the UV globe housing, since a filmed-over sleeve blocks the light that does the work.
• Once a year: UV globes lose their punch long before they stop glowing, so plan to swap the globe about yearly even if it still lights up.
• Autumn: net the leaves off the surface before they sink and rot, which is the single best thing you can do to keep spring water clear.

Get the filtration right, keep the flow steady and stay on top of the cleaning, and clear, healthy pond water stops being a battle. For the bigger picture on how ponds sit alongside pumps and the rest of the garden, have a read of our guide to water in the Australian garden, and if you are still planning the pond itself, start with how to build a garden pond.

Building a garden pond is well within reach for a weekend-handy homeowner: choose a level, partly shaded spot, decide how big and deep you want it, dig and shape the hole, line it, add water movement, then plant it and let it settle. The two parts to leave to professionals are the pump’s electrical connection (a licensed electrician) and checking whether your council has depth or fencing rules. Here’s how it comes together.

Choosing the spot

The right position makes everything easier. Look for somewhere that gets a few hours of sun but isn’t baking all day — too much sun feeds algae, too little starves your plants. Avoid the lowest point of the yard where stormwater runoff and garden chemicals will wash in. A reasonably level area saves you a lot of grief when it comes to getting the water line even.

Safety matters too. If young children use the garden, think carefully about open water. Some councils treat ponds over a certain depth like pools and may have fencing or barrier requirements, so check your local council’s rules before you dig.

How big and how deep

Bigger ponds are actually more forgiving — a larger volume of water stays more stable in temperature and chemistry than a tiny one. For depth, you generally want a deeper zone so the water doesn’t overheat in summer and so fish, if you keep them, have somewhere cooler to retreat. Shallower margins around the edge give plants a home and let wildlife get in and out. There’s no need to chase exact figures; scale it to your yard and how much maintenance you’re happy to do.

Flexible liner vs preformed shells

You’ve got two main ways to hold the water. A flexible liner lets you make any shape and size you like and tends to suit larger, natural-looking ponds; it’s draped into the hole and shaped as you go. A preformed shell is a rigid moulded pond you drop into a matching hole — quicker and simpler for a small pond, but you’re locked into its shape and size. For a first pond, a preformed shell is the easy option; for something organic and bigger, a liner gives you freedom.

Digging, shelving and edging

Mark the outline, then dig in stages, cutting a shallow shelf around the perimeter for marginal plants and a deeper central zone. Remove sharp stones and roots, and add a layer of sand or underlay to protect a liner. Set your liner or shell, check the rim is level all the way round, then fill slowly so it settles into shape. Finish the edge with rocks, pavers or plants to hide the liner, hold it down and create a natural transition into the garden.

Water movement: why most ponds need a pump

Still water tends to go stagnant, grow algae and lose oxygen. A pump keeps water circulating — running a small fountain, a spillway or a filter — which keeps it clearer, better oxygenated and healthier for fish and plants. Choose a pump suited to your pond’s size and what you want it to do, whether that’s a gentle ripple or a proper waterfall.

Position and plumb the pump yourself if you like, but the electrical connection must be done by a licensed electrician, on an outdoor RCD-protected circuit. Mains power beside a body of water is exactly the situation those rules exist for — it’s not a DIY step.

Planting and letting it settle

A new pond needs time. Add a mix of plants — submerged oxygenators, marginal plants on the shelves, and a floating-leaf plant or two for shade — and then be patient. The water may go cloudy or green at first while it finds its balance; that’s normal. Hold off adding fish until the pond has settled for a few weeks and the plants are established. Top up with rainwater where you can, and resist the urge to fiddle. Within a season most ponds find their rhythm.

A pond is one piece of the bigger water picture — see how it sits alongside pumps, features and water-wise design in our guide to water in the Australian garden.