I have a 75 and a 20 running right now. The 75 is mainly a Bichir tank so I don't think they'd fair too well in there. The 20 is a temp tank and is mainly for my Crayfish to heal up after a molting incident.
I did however buy a nice 40 gallon yesterday, 36"x18"x16", it's very wide and I'm going to set it up soon. If you have anymore left after a few weeks I'll gladly take them.