The RBTA's inhabit the rear right corner of my tank. Their rock area is about 3 ft X 3 ft X 30 inches high. They pretty much keep isolated to this area. There are two pairs of true percs, a pair of clarkis, and a pair of pink skunks that live in the mass peacefully. The RBTA's are getting to the point of having no more room at the inn....I traded in 8 of them to the LFS recently. I started with 3 or 4 five years ago. Sorry....I don't ship....just trade in.