Gallonage is pretty irrelevant in this situation. Footprint would be the issue. Personally I would do atleast 72x30 for a minimum footprint.
Gallonage is pretty irrelevant in this situation. Footprint would be the issue. Personally I would do atleast 72x30 for a minimum footprint.
For the 3 oscars a 100 gallon is fine for ... for a clownknive and 3 oscars a 150 gallon is fine, but maybe a 120 but a 150 plus is a lot better...
For the 3 oscars a 100 gallon is fine for ... for a clownknive and 3 oscars a 150 gallon is fine, but maybe a 120 but a 150 plus is a lot better...

What are the dimensions on the tanks you list? I hope you wouldn't stuff these fish in a standard 150 (72x18" footprint)