What size pump to use with this UV? I have a 100 gallon total volume mixed reef. I am looking at either the sicce 1.5 or 2.0 the 2.0 is 500 gph which I think is a little fast but I'm guessing the 1' head from the bottom of my sump to the UV will make the 2.0 about right. Any suggestions? What do you use?

