Welcome. Oh sorry I had a 29g. I took the top off and mounted a 175 watt MH about 12 inches off the top and cut a piece of plexy for it. Also don't use the bioballs, I put macro algeas back there and sucked detritus out with a turkey baster (get one it will be a lifesaver). I upgraded the tank to a 40g 2 years ago but let me know if you have anymore questions.