Used 1/4hp JBJ Arctica chiller, works great, I just don't need it anymore since switching to all Leds over the 250g. $300 cash in Glen Rock, NJ. Has 3/4" fittings, I may be able to scrounge up the 1/2" and 5/8" fittings. It's been soaked in vinegar and washed out with freshwater.