Thanks for the fast response. I have sold off most of the 75gal equipment to make room for the new 30.(Iknow I'm going backwards) I have kept the chiller, lighting ballasts, litermeter, calcium reactor etc. I have not decided on return pumps or other devices yet. I know I will be running an approx 20 gal sump w/ a 10 gal refugium and I will probably use some sort of oceansmotions unit for the water return. I am still undecided on a skimmer. I was just thinking that maybe I should sell this chiller and buy one that is better suited to this volume of water. I don't necessarily like the drop-in cooling coil either. I already have the tank. It has a 4x4 overflow in the center of the rear and two return bulkheads, 1 on each side of the overflow. I think with a strong pump and an alternating device I wont need a c/l. I will have to set up and then make that decision.