T-5s is all I gotta say......Ive seen MANY successful tanks growing clams and shit like that with just T5s. Ive had them with awsome results. Put a fan or 2 or 3 over the top of the water on the display tank and if its got a canopy put a fan in there and vent that bitch. If you got a sump get a low heat transfer return pump and put a fan over the sump also. I had OVER 1600 watts of lighting on my 180 and NEVER needed a chiller....