You could quiet nicely keep mbuna in a 55 as well, I don't get why it's being resorted for SA's in this thread. A footprint of a standard 55 plus lots of rockwork and carefully chosen species would work, it has been done before 
That's another question. if I went with the 55 and SAs, how much could I put in there? So far I've kept fish that are small enough to more or less manage the inch-per-gallon rule but one sev probably is the same amount of mass as, what, 20 bloodfins?
I'd like to keep a sev, an eartheater (I'm leaning towards a Satanoperca,) an acara or (if I don't put the angel and keyholes in there) maybe a jack (although that probably wouldn't work well with the Satanoperca anyways), some catfish, and them some dithers. I'd love to pair up the sev or the acara/jack as well. Would that work in a 55, or a 75? Is it even -close-? I'd think it would work, but then again I also thought that an Oscar would be just fine in a 55, so I probably should just avoid thinking.![]()
That's another question. if I went with the 55 and SAs, how much could I put in there? So far I've kept fish that are small enough to more or less manage the inch-per-gallon rule but one sev probably is the same amount of mass as, what, 20 bloodfins?