for a tank? Looking at all the sizes and dimensions I already know what length I want, but what is a good height and width for a tank. Looking around I see that there isn't much price difference between a 300gal and 400gal. tank so I figure why not just get the 400gal. one instead. My question is what should the width and height of the tank be. Would a 96Lx36Wx30H be good?