I'm finishing my basement starting in a couple weeks. As I do it, I'll be incorporating twin 180g tanks side by side, for a "wall" of fish. I am planning on making it a ray/gar/arowana tank with one of each in each tank. However I want a gar that won't feel cramped after a couple years in a tank that's only 6' long. I've heard of breeds that don't get that large, so I was going for something like that. My LFS has everything I need, but I was wondering if I'd run into any problems with them. The tank will be FW, and I'd like some ideas on some smaller tank mates so the tank doesn't feel as "empty".