well first of all, i have one small rhom in a 15 gallon tank, i know thats small and i am upgrading soon. first of all, would a 30 gallon be any better than a 20 long for just this one rhom? i dont plan on putting anything else in there. the rhom wouldnt allow thatso anyway, when i go to change tanks, i might want to reuse the rocks and such in my tank now, what should i do with the rhom while i empty all of these things out? or should i just go with new rocks?