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Hi everybody, i have about 5 cories in my 55 gallon tank. 2 albino and 3 green. Before I change my water they are kinda active they swim to the top of the tank, around the bottom also. Once I am doing my water change they are everywhere, even swimming alongside my angelfish. Once I add new water (probably a 15/20 gallon water change every week) they just sit there and go back to having little to no activeness.