Excuse me for jumping around with the questions. The more I get into this and read, plans keep changing. So we started out with a used 125g thinking we saved a bunch of money. I planned to use a 55g to build my sump in the basement. Well the glass on the 125 has seen better days although it is still a sound tank. I think the wife and I have just about talked ourselves into getting a new reef ready 180. She had mentioned moving to a bigger tank than the 125 later but I'm not keen on the idea of tearing down once I get something going. So the question is...Will the 125 be practical for a sump or should I try and sell it and stay with the 55 ? I know it's said more water volume the better but I imagine it also means more to heat and pump etc. I could go either way because I know I'm not going to get much money out of the 125g and we have the space.