Funny thing.. I was thinking I don't have enugh flow. The only flow I really have right now comes from the over flow and return, though the return is a mag 900 so its pretty strong. I was thinking about the sand as well(though as someone mention distrubing it could be even worse). Honestly I bought the tank from a guy who has several tanks setup in his house and they are beautiful and full of awesome corals and life, so for whatever reason I am an idiot and for the first month or so I would listen to his word as though he was the God of Reefing, eventually telling him to piss off cause every idea I had was a bad one, "you don't need a 20 gallon sump it will be too big, you shouldn't use LEDs they will bleach the corals" Etc. My sump works fine, if anything I wish I had a bigger one! I love LEDs, hello no bulb replacements every 6-8 months! Ok rant done. Thant being said he did give me his sand to start, so I keep thinking what might have come in that sand and should I pull it all out and start with fresh sand? As far as more live rock I am getting more, I have been doing my research becuase since I have some live rock in there I am thinking abouyt getting dry rock(thoughts?), which brings me to my next point/question. I have coraline alage growing all over my was and every where in my sump tank, should that be helping win the battle against nuiscance algaes?