I really think it was a good invention , it prevents all the food from getting into the filter, sucking it in and ruining your filters faster. My Koi is about 13 inches tall, her name is Petunia and she is quite smart, the first day she learned to go to the pitch and feed she didn't like it at first but within 24 hours she was learning to I think she likes it very much because she doesn't have to chase food around the aquarium
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