Its an old house, and I only filled the tank up 2/3 of the way because I'm worried the floor may not be strong enough (although it seems to be handling the tank so far with no problems). In a couple of weeks I might fill it up more. I have two questions. In this tank I have a young green terror, a young jack dempsey, a young albino oscar and a young firemouth. They are all 3 inches. Is this overcrowded? The second question is: do you think a 90 gallon tank is alright on the second floor? The floor seems very sturdy and its in a corner. Thanks.
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