Did a little research on reactors with gfo, carbon, & purigen ran in them. Ive havent had a problem according to my API test with phosphates in a good while but not sure about silicates and what not. I still get a little hair algae and every now and again a reddish cyano/hair looking stuff. Just wondering what all the benefits are are running a reactor and with what media. I was looking at the 'two little fish' 150 model. What size pump would be good for 39 gallon tank with about a 20 gallon sump? I have a couple SPS frags im trying as well to have a mixed reef. Is it a smart investment?