Ok, so i've been cruising around on here for a few days have have seen several references about people thinking a tank might be too big. I'm curious, what's the down side of a large tank? I just aquired my set up from some folks off craigslist and the tank is a 90 gal., which is huge, I know. But is there really a down side, or is it just harder to maintain the correct conditions in a larger tank that is the concern? I suppose to some degree its a waste of space, but I want to make sure its not going to be a detriment to her health to have that big a space.