- Mar 19, 2009
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I didn't feed mine. In addition to the mosquito larva and other bugs that hit the water, goldfish eat the algae that grows on the side of the tank. Here in Missouri I have some fish in the bathtub I have in the big dogs' pen. I got some goldfish food but they weren't interested. I am not sure what they are eating, but they are growing. It wouldn't hurt to occasionally offer your fish small amounts of feed. If they need it, you will find out soon enough.