I had my reef setup for almost 3 years with a canister filter. December 2003 I decided to get a tank with a built in overflow. So I picked up the tank. I figured why not do a DSB since I'm moving the tank. So I made a fuge, put my DSB in the tank, and had my new setup running. In June I bought some rock which I later noticed had hair algae. It spread over all of my rock. All levels checked out and I couldn't figure out what the problem was. So in desperation I moved my tank and did starboard sheeting on the bottom. So it's basically barebottom. I still have hair algae worse than ever. I don't have a single rock that isn't covered in it. Here's a list of what I have done to get rid of it: Bought 120 blueleg hermits, 120 astrea snails, 35 turbo snails, 65 scarlet hermits, 3 electric blue hermits, 15 margarita snails, 6 lettuce nudibranchs(passed away since i got my stream pump) and 1 Seahare(all of this was bought randomly a few here a few there). I use Phos-gard 24/7. I siphon out the algae every week with a five gallon water change, and dip out what's floating with a net. Here are my current test readings: ammonia-0 Nitrate-0 Nitrite-0 PH-8.3 Calcium-420ppm Magnesium-1410ppm Alk-8.4 dKH Phosphate-0-.01(this is correct it has been tested my 3 LFS's and myself) Silicate-0 Here are the only other things I can possibly think to get rid of it: UV sterilizer(not even sure if this would help) Lawnmower blenny(i've heard some bad things about them recently) Taking my tank down selling the stuff inside and doing a freshy discus/plant tank. I have recently noticed my RO/DI water has a fishy smell. I'm not sure why. It has had hot water run through it accidentally. I plan to try and buy a new membrane if you think it is no good. Although it was recently changed. I have also had a fuge full of hair algae and have had the light off for a month and had turbos in it. It's still full of algae regardless. I have ran out of options and ideas on what to do. I seriously upset my self when the thought ran through my mind of switching discus because I love my reef. I've had it, my hobby has turned into a curse which I'm constantly fighting and trying to fix. It is ugly and I'm ashamed of my tank. SO DOES ANYONE HAVE ANY IDEAS?!! Please help me out.