I think everyone on this forum has bought a tank from a chain store - anything up to a 40 or 55 gallon. I think the quality really matters when you get into the big stuff, walmart or petsmart or ***** don't sell really big tanks (100 gallon plus). I bought a 40 breeder at ***** at the dollar a gallon sale - I have it now set up for a fuzzy dwarf. It all depends on what you are looking for and want to spend. Personally the tank is the cheapest part of this hobby, lights, live rock, sand, skimmers, controllers. It is like when you fame a house that is the cheapestes part - it is what you put in it that costs.