hi guys..i am selling a uv unit that comes with everthing you need...i change my mind in putting it in my tank...so the bulb hasn't even been used..i am asking for 35$ shipped...comes with powerhead great in any tank...lmk..
9 watt for a 120gal is underpower, you need at least 15watt min. to be on a safe side a 25watt is sufficent. BTW you don't need a UV on a reef system, i would only use it on Fish only.