I'm not sure what caused this bloom but it's been bad. I put one of the 67000k florescent flood bulbs in my fuge about a month ago and cut back my chaeto to about half of what it was. Also, my DI unit exhausted at the same time. I had to add top off water of regular tap for a few days. My corals started to close up and look unhappy so I moved them to the tank upstairs. The new 5 stage RO/DI unit came about a week later. Right about that time I noticed all my snails were dead and the back of the aquarium was covered with brown algae. Thats when the red algea started. This tank has been in direct sunlight at sunrise and an hour or so after that every day. I considered maybe the morning light was causing the red algae so i installed blinds. The brown algae went away a few days after the new RO/DI unit was hooked up but the red algae, or at least that's what i think it is, will not go away. I think my fuge is in bad shape too because the red algae is growing on the chaeto and seems to be smothering it. I put a small power head in the fuge but it looked like the chaeto was dieing because it started turning white so i took it out. I've tried turning the flow up for a few days then down for a few days but nothing seems to be doing anything. The chaeto is getting smaller every time i look at it. All the mushrooms i left in the tank shriveled, released their stringy insides and started breaking apart. I think they are dead. The fish are doing really well, I still have several crabs and all of my coral shrimp are still alive. I have a Aqua UV 15W Advantage 2000+ HOB UV Sterilizer coming in a few days and new bulbs for my hood. My parameters are nitrates 20, phosphates 0, ammonia 0, Calcium 450, ph 8.3 salinity is dead on, water temp is 79 with a JBJ chiller keeping it consistent. I'm also using these in the tank SEACHEM PURIGEN SEACHEM PHOSGUARD I don't understand why this is happening after having the tank for several months with no problems and very healthy coral. My skimmer is working very well giving me about 2 cups of thick green skimate each week. Maybe there is just to much organic matter in the water. The surface has a film on it I can't seem to get rid of. Can you guys throw me a bone here. I'm doing everything i can and nothing seems to be helping.