If you use copper in your water, you may risk not having enough in the tank for him.. I have a 120 and have had my eye on one for a while, but my shop keeps talking me out of it, because I use copper in my water.
the queen angel pic i have as an avtar...$85...and she almost died of lymph ...cured her with garlic extract - great stuff. Didn't even use a hospital tank (couldn't catch her and didn't want to get her anxiety level too high and chance loosing her)...so diet worked.