Do you guys need a chiller for your aquarium with your lights? I had a metal halide with my compact fluorescents on my aquarium for awhile but I switched over to just cf lights (currently 4X 96 W). Although my tank still gets into the low 80s. With my loaches, I decided to invest in an aquarium chiller (that set me back some!). I got a 1/3 Hp Prime chiller by current usa. Unfortunately, it needed a 1" tubing connect and about 900 gph! As you can imagine that would throw the plants everywhere with that current. As a result I decided to make a large output to significantly reduce the flow. The diameter change was 1" tubing to 2 or 3" pipe outlet (I can't remember).