Sorry not to steal the thread but i have one quick question. If i were to de-rim my 90 gallon will it affect the structural integrity? In other words can you de-rim any tank?
I would probably not de-rim a tank of that size. I think there is a thread here about somebody removing the rim of a 75 gallon and it was fine. If you did I would think about bracing it with glass. Even then I don't know how well it will hold up.