I already have one of the Apex controller on my display tank, but someone I work with gave me his old Apex, trying to decide if I should sell it or keep it for my QT tank? I just wonder if it more trouble than it worth. My QT tank is 40 gallons, that runs 24/7. It only used now to treat sick fish or new fish, sometimes I use it to grow out larger fish, so using it for bunch of stuff, but rare I get new fish now that my display has the fish I want in it. What would you guys do? I have someone that wants to buy it for 375, that why I am bit torn what to do.