We've got a bunch of tanks, about half are all setup for turtles or lizards, really only have 3 tanks for fish and two ponds.
I've got a 40 gal hex that is just community, mainly guppies, couple silver dollars, etc. I just set up a 45 gal bow front as Oscar/cichlid tank. I keep losing fish though, need to had some better bio and air filtration, my canister is not doing the job.
Son had 55 gal for his turtles, but we build an enclosure using a 100 gal pond liner so now we have indoor pond in basement for his 4 turtles.
I'll have to snap some pics when I can time.