Aquarium Feeding Ring: What It Does and Which Size to Choose
A feeding ring is one of the simplest aquarium accessories, and yet many people ask me what it is actually for and which size is right. Here I explain when a feeding ring is worth it, which size fits your tank and what to look out for when buying one.
What does a feeding ring do?
A feeding ring floats on the water surface. When you put flakes or floating granules inside, the food stays within the ring instead of spreading across the whole tank. That has several advantages:
- Less food in the filter. Without a ring, the current pulls part of the food straight to the filter before the fish even get to it.
- Fewer leftovers in the tank. Food that drifts into corners and sinks rots in the substrate and pollutes the water.
- Better control. You can see exactly how much is eaten and quickly notice if you are overfeeding.
- A fixed feeding spot. Fish quickly learn where the food is and gather there. It is also a good moment to check that everyone is healthy.
Which size fits my tank?
The size mainly depends on how big your tank is and how many fish feed at the surface at the same time. As a rough guide:
| Ring size | Suitable for |
|---|---|
| 50 to 75 mm | Nano tanks and small tanks with few fish |
| 100 to 150 mm | Most tanks from about 54 litres |
| 175 to 225 mm | Large tanks, many fish or as a zone for floating plants |
My rule of thumb: the ring should be big enough for all fish to have room while feeding without pushing each other away. If you have a large school, go one size up. With a lot of fish, two rings in different spots can make sense so the weaker ones get something too.
If none of the standard sizes fits, get in touch. I can print custom sizes.
Free floating or with suction cup?
A free floating ring drifts with the current. In tanks with little flow that is completely fine. If the current is stronger, it quickly ends up in a corner or right at the filter.
A ring with a suction cup is attached to the glass and always stays in the same place. The feeding spot is the same every day and the fish get used to it faster. I use quality suction cups made in Germany that still hold after months.
Which shape is right?
Functionally, the shapes don't make a big difference. It is more about what suits your tank:
- Round: the classic, fits anywhere.
- Rectangular: sits nicely against the glass and suits long, narrow tanks.
- Triangle: made for corners, takes up hardly any space.
- Heart and cloud: if it is allowed to look a bit playful.
You can find all shapes and sizes in the floating rings collection.
Feeding ring and plant ring in one
Many people use the ring not only for feeding but also for floating plants like duckweed, frogbit or water lettuce. The plants stay in one place and don't cover the whole surface. I explain exactly how that works in the article How to control duckweed in your aquarium.
You can also use one ring for plants and a second one for feeding. That way the food doesn't get caught in the roots.
What about shrimp and catfish?
A feeding ring mainly helps with food that floats at the surface. Shrimp, catfish and other bottom dwellers eat down below. Vegetables like cucumber or zucchini are great for them. To stop them from ending up in the gravel and rotting unnoticed, there is my feeding holder with suction cup. Spear the vegetable, press the holder onto the glass and your animals always find their food in the same spot.
Material: what to look out for
Many cheap feeding rings are printed in PLA. PLA is easy to print, but it becomes soft and brittle in water over time. That is why I print my rings in PETG. The material is water resistant and stays dimensionally stable even after months in the tank.
To clean the ring, just rinse it with lukewarm water or a little aquarium water, and use a soft brush for any film. Please avoid hot water, the dishwasher and dish soap.
Quick summary
- A feeding ring keeps floating food in one spot and away from the filter.
- 50 to 75 mm for nano tanks, 100 to 150 mm for most tanks, 175 to 225 mm for large tanks.
- With a suction cup, the feeding spot always stays the same.
- For shrimp and catfish, a feeding holder for vegetables is the better choice.
Not sure which size fits? Send me your tank dimensions via the contact page and I'll help you out.