I am getting a 30 gallon tank tomorrow with a iron stand and the bottom has enough room for the 20 gallon I already have. Do you think it is feasible to use air for filtration in both tanks or should I use HOB for both? I know I would need a pretty high air compressor to pump that air, no crappy 2 valve whisper will do. The fish in the 30 gallon will be cichlids (south american dwarf cockatoos) with firemouths and the 20 below will be my fry growout tank with molly fry and anything else I can get to mate... My current fry tank has double air filtration in both corners and fine gravel. Should I just remove the gravel and have a bare bottom for the fry take with some driftwood and anubias for plant growth.

thanks in advanced.

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