I understand where your comming from Bob, and we may end up having a tank available in that size, at the same time we are trying to factor in what will sell. the fact that most people purchasing a tank of that size will buy a glass tank over a more expensive acrylic tank needs to be addressed, not all will do this of course but we have to sell enough to make the mould worthwhile. These are high end show tanks, and more people who are purchasing a high end show tank, seem to be looking for a tank of more than normal dimensions, they want something impressive. I think that more people that are willing to shell out a few hundred bucks for a smaller 36" tank would want a more impressive 36"x24"x24" instead of a standard 36"x18"x18". But if we dont make one to start with, and we get alot of demand for it, we will make one. the problem we face is the cost of the custom moulds for every size of tank, as they are individually cast.