TY FATMAN I WANT A REEF TANK...YES I WAS THINKING OF HAVING A REFUGIUM AND THE SPACE FOR THE SKIMMER ..SO A 20G WILL BE OK . AND ALSO I NEED TO GET AND OVERFLOW BOX THE ONE IM LOOKING AT HADS A FLOW RATE OF 500GPH AND DO I NEED A REPUMP AT THE SAME GPH?

CHRIS