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under gravel filter
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  1. Koi and Goldfish
    I‘ve had a 30 gallon tank with 2 fantail goldfish for over 30 years. I started with a Penn Plax under gravel filter, with an air pump. I switched to an AquaClear 150 power filter a while ago. I left the filter plate where it was, removed all the tubes and put caps on the holes. I was happy...
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