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I have grandkids that love to feed my fish- and a husband that does too- problem is the fish will eat as many times as you feed them!! The water dirties very quickly too from non eaten food. What I came up with is a piece of paper with 2 circles on it when you feed the fish if it's in the morning you cover that up. Exposing the feed me at night time circle- and at night you do the same re exposing the morning circle see no more wasted food and the fish get fed 2x a day in stead of 4 or 5