They are very suitable for feeding in aquariums with a lot of movement near the water surface. The only time this might not work is when you have a high enough water level that you don't have dry glass to glue it to. If your aquarium lid only has a tiny feeding hole, the ring or square may not be in a good position relative to the hole in the lid as the ring/square will protrude a few inches from the suction cup mount. him to the tank.
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