My Rose BTA was not happy until I got him in my 50gal. I had him in a 20gal for over a year, but he never did all that great.. Since being in the 50 gal he has easy quadrupled in size.
I think a better guage would be to ask, how much experience you have in reef keeping in general? What sort of animals do you currently keep? Chances are if your experience is limited to a 10gal nano with a atinic light and some softies, your not ready for a anemone.
Your better off slowly graduating yourself to some more difficult things, for instance, maintaining your tank at acceptable levels for a long duration. Would be your first task IMHO.
This would include, nitrate at near zero, SG that is fairly steady, Alk at 10dkh or so, Cal at 450 or so. Etc etc..
baby steps
