hey i have a 75 gallon reef tank and i am really glad i got a uv sterilizer, i got the LifeGard Uv sterilizers, its the QL series its 25 watt. protects up to 200 gallons and kills agle up to 1500 gallons , i paid $289 but thats because the fish store was closing but there around $450 and its great, it was alot better than the 8 watt ones they tried to sell me.