Works great. I just let him eat in the tank for 2-3 minutes once or twice a day. Washes off easily. Fish quickly [after 2-3 acquaintances] learn to swim to the rings and eat what's inside. The ring prevents food from leaking out. As a result, less food gets into the aquarium water. And that, in turn, makes the water cleaner, so you put less strain on the aquarium, change the water, and so on. Cheap and very useful. Gave the second ring to another aquarium owner.
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