I have never used a chiller for my home aquariums and I have never purchased one either. I am looking for one that will allow me to keep my 250 gallon aquarium (96" long x 25" tall x 24" deep) with a standard sized 55 gallon acrylic aquarium as a sump with about 30 gallons of water at temperatures from 60F to 75F. I must aslo added that I am a bit strapped for cash so I cannot go out and get a thousand dollar chiller. Can anyone help me here? What should I get?