tex,i have a nano cl85 chiller for my 1000w grow cab and it works great, seems to keep my res about 8 or 9 deg colder than my cab, im going to try insulating my res and chiller lines also. Im looking to chill a bubble system that im setting up with cfl so there wont be much heat, i was hoping to get away with a 100 doller ice probe that requires no pump, if i get good feedback on them ill try one, if not im useing my cl85 and getting a cl150 for my cab, im running co2 so id like the cab at 86 or so and the res water at 65-68 I didnt get my chiller in time and now im dealing with root rot, I just orderd some hygrozyme and with the help from people on this site (thanks morris) Im sure Ill pull tru, im keepin my waters cold bro!