Keeps the food in one place until it is eaten.
Food dropped into open water drifts to the filter within seconds, so you add more, and the tank ends up with far more food in it than the fish ever ate.
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Design: Round
Why you'll love it
Flake that drifts under the substrate rots there and drives nitrate and algae. Corralling the food where the fish are is the simplest thing you can do about it.
Feed inside a ring and you can see exactly what is left after two minutes. Almost everyone overfeeds, and this is the cheapest way to find out by how much.
In an open tank the fast fish take the surface. A fixed feeding point lets you put food where the timid ones are, and add a second ring at the other end if you need to.
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Most tanks have surface flow, and flake floats. Within seconds of going in, a good proportion of it has drifted across the tank and into the filter intake, where it does nothing except add to the waste load. What the fish actually get is a fraction of what you put in.
That is where overfeeding starts. You see food disappearing and conclude the fish are still hungry, so you add more, and the extra follows the first lot into the filter. Containing the food makes the amount the fish eat and the amount you added the same number, which is the only way to judge a portion honestly.
In a mixed community, fast mid water fish take almost everything from an open surface feed before slower species have arrived. Over months that produces a tank where the danios are thriving and the gouramis are quietly underfed, which is difficult to spot because everything looks lively at feeding time.
A fixed ring helps because it becomes a known location. Fish learn where food appears and gather there, which gives slower individuals a reliable place to go rather than chasing drifting flake. The double layer versions separate floating and sinking food, which lets you serve two types at once without them mixing.
Put it away from the filter outflow so the current does not push food under the rim, and somewhere you can reach easily and see clearly. A corner is usually best: it is out of the main flow, it is easy to reach over, and fish are comfortable feeding near cover.
Bottom feeders need feeding separately regardless. Sinking pellets or wafers dropped in after lights out, once the faster fish have settled, is the way to make sure catfish and loaches are actually eating rather than living on whatever escapes.
Lift it off after feeding if it bothers you visually, though most keepers leave it in place. Left permanently it becomes part of the routine and the fish gather at it before the food arrives, which is a useful daily chance to look at every fish properly and notice anything wrong early.
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The details
| Shape | Size | Best for |
|---|---|---|
| Round | 7.5 cm | Nano and small community tanks |
| Square | 10 × 10 cm | Larger tanks, or more fish feeding at once |
| Double round | 7.5 cm, two layers | Floating and sinking food kept apart |
| Double square | 10 × 10 cm, two layers | Larger tanks feeding two food types |
Size on the number of fish feeding at once rather than on tank volume. A ring too small for the group means the same competition you were trying to avoid, just in a smaller area.
Loved by real pet parents
The idea works and the food does stay put while they eat it. The suction cup on mine loses grip after a day or two and the ring ends up floating loose, which rather defeats the point. I press it back on most mornings, so it is not useless, just not reliable.
I went for the 10 by 10 cm square version and it takes up a noticeable chunk of a small surface. It does keep the flake in one place, which is what I wanted. On a bigger tank I think it would look fine, on mine it is a bit dominant.
Half of every feed used to drift straight over to the intake and get pulled in. Dropping it inside the ring keeps it where the fish are until it is eaten. The filter sponge is visibly cleaner between rinses now.
Feeding inside the ring meant I could actually see what was left after two minutes, and the answer was about half of it. I have cut the amount down twice since. Nitrate has been steadier as a result, which I did not expect from a plastic hoop.
The fast fish took everything at the surface and the shy ones got whatever fell past. A ring at each end lets me feed both groups at once and everyone eats. The cups hold well on clean glass.
I picked the double round version so the sinking wafers and the floating flake stay apart. It does work, though loading both layers without spilling takes a moment. It lifts off in one piece for a rinse, which I do weekly.
A small tank did not need anything bigger and the round one sits in the corner without crowding the surface. Food stays inside it rather than blowing across on the filter flow. I barely notice it now the plants have grown up around it.
Once I scraped the algae off the spot where it sits, the suction has been fine for weeks at a time. Before that it kept popping off, which I had initially blamed on the ring itself. Worth knowing rather than assuming it is faulty.
Everything used to spread across the whole surface and end up behind the plants where it rotted. Now it stays in the ring, gets eaten, and the substrate is much cleaner when I vacuum. Takes seconds to lift the ring off and rinse it.
Good questions
Partly. It holds them at the surface for a moment and then they drop straight down inside the ring's footprint, which is still tidier than scattering. The double layer version handles mixed feeding better.
Away from the filter outflow, or the current pushes food straight under the ring and out. A back corner with slow water is usually best.
On clean glass, yes. Wipe the algae off the spot first, as a cup on a biofilm slides down the glass within a day.
The double layer versions do, keeping sinking food separate from floating flake. A single layer ring is for floating food, since pellets drop straight through.
Away from the filter outflow, ideally in a corner where you can reach and see it. Fish are also more comfortable feeding near cover than in open water.
On clean smooth glass, yes. Clean both the cup and the glass occasionally, since algae film under a cup is the usual reason one starts letting go.
Last reviewed 30 August 2026