I saw a thread similar to this but he never got an actual answer. I have a 3-4" Rhom in a 29 gallon. It seems to be perfectly fine in this size tank for now, but how long will it be, if ever, before I need a bigger tank, and how big should it be? I do live in an apartment, and being on the second floor in an older building leaves me worried about the weight issue of a much larger tank. THANKS!