CraigJ, I didn't say you couldn't keep one in a 10 gal, just you shouldn't. I don't care how small it is when you put it in there, before you know it it will be as long as the tank. I would never consider getting a sfe for a 10gal. Anyone that is in this hobby because they love thier fish would never do this, not if they want HAPPY, HEALTHY AND STRESS FREE FISH, if they don't care then I guess they are going to be in for a big disappointment, thier fish will die or be sick all the time. When we started in this hobby, we said if we can't do it right then there is no since in doing it at all. I know that a sfe would never be happy in a small 10 gal. How will it get excerise? Ours excerises every night, he comes out and swims from one end of the tank to the other. Every night! As for my feeling bad with ours in a 72, for his size I felt he should be in a bigger tank, oh sure he seemed fine, and he ate like a horse, but he could not get out and swim, not much anyway. In the 200, he comes out and swims like crazy. We enjoy him so much more, when we see him swimming back and fourth through the tank. Just my opinion. Lisa