Ok so i got this 18 Watt Coralife UV light with a recent 180 gallon tank i bought. Problem is im not up on my UV knowledge. But i know its rated for 300 GPH max and will treat up to a 250 gallon tank if PROPERLY used. The previous owner had it plumbed inline with a 925 GPH Fluval FX5, which means water was traveling through the unit at 3 times recommended GPH and was useless. I bought new lines for the FX5 and that's running smooth now. But i need recommendations on this UV installation. I believe id like to hang it on the back of the tank, and yes a new bulb was ordered. Any suggestions?