Hello,
I have two comet goldfish that are inseparable and are now maybe 4" long from tips of mouths to tips of tails. I have them in a 30-gallon extra high tank, which is just about 24" high, and 24" wide and 12" deep (front to back). I have four different pump/filter units on this tank (overkill?) and very nice water surface movement. The fish still seem reasonably content but I feel bad that they are in this relatively confinded space. The temperature in this tank is room temperature, so it varies from 70F to 74F in the winter and may go as high as 80F in the summer.
In the same room I also have a 90-gallon tank (24" high, 48" wide, 18" deep) that houses three massive plecos, which are one-foot or more in length, one tricolor shark that's about 5" to 6" long, one giant danio that's about 4" long, and one cory catfish. This tank has two Rena Filstar XP3 pump/filter units on it and it's heated so it never goes below 76F.
I've heard everywhere about not mixing goldfish in the same tank as tropical fish. But the question is whether the goldfish would be better off staying in the 30 gallon tank or would they be better off if they were moved to the 90 gallon tank. Those are the only two options so please do not suggest others. :-)
Thank you for whatever advice you can give me.
Mitch
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