i am setting up a 120 gallon tank. i do not have a built in overflow but a hang on overflow. i purchased the wave box and overflow at the same time and the dealer said that there wouldnt be a problem. the problem is i can not hang the overflow in the middle do to the brace of the tank and the overflow only hangs down about two inches from the top of the tank. i have not added water but noticed this could be a problem when i mounted the gear to see were things would be positioned. has anyone used a hang on overflow with the wave box??