Thanks snoop and racer. Snoop after reading your kick ass grow log I will definately be seeking your advice once i'm up and running. I'm still getting a different air pump and another stone but I will definately put some thought into keeping my res cool. I noticed the 2 ways you had mentioned that you keep yours cool and with racers........any other ways? this is gonna be a cab grow w/a 250w in a cool tube so i think i'm gonna have a few heat problems. Thanks again