i figured i should make a thread about my aquarium because of recent confusion. my tank is supplied by red lobster (dont ask how i got it, LONG story) and it is made for lobster breeding. i drew up a sketch of how the tank is laid out. originally it had a undergravel filter and there is three sections. top is the DT obviously which is 4x2x2 approxamately with about 1in glass. under that there is an area where they had crushed coral to keep the ph up and act as filter media for the undergravel filter. the third but coolest section (no pun intended) is where the chiller coils sit because it has a built in chiller. when i was designing how i would set up this beauty i wanted to make use of the chiller and not have stagnant water down there eventually probably making my tank crash. the way i set it up is i have the return from my sump hooked up to where the undergravel filter air tubes used to be. (the area where the air flows through to have water pulled through the rock). so now my return for the sump is returning through the sand lake the reverse of an undergravel. sorry this is really hard to explain without real pics. if there is any questions just ask!