Im no expert, but I had the same problem for like 3 months, came here on rc, and was told it is a natural part of the cycling process that occurs on younger tanks, and that it would go away on its own. I could siphon if I wanted to, just to keep it at bay. So thats what I did, just sucked it out and waited. And as quickly as it came it was gone, after waiting another couple weeks. I was told that no matter what you do, it will occur on a newer tank. My tank was 4 months old when it began growing, and about 6-6 1/2 months when it cleared up. It is now 10 months and still havent seen a speck since it cleared up. It covered everything, and I searched and searched, and all I could find was a definition of what it is instead of how to rid it. Then I came to RC, and they told me to wait it out, and they were absolutely right. I personally dont think a reef tank is completely finished its stages and cycling until the first year has passed. That seems like a long time, but I thought 6 weeks ended the cycling, but it seems a new stage comes along when another finishes. Patience is a virtue in this hobby, I learned that the hard way. It is really hard to be patient with something that is so beautiful and fascinating, especially when ur beautiful and fascinating creation has red slime covering its inhabitants and substrate and anything else in it. At that point in ur newly found hobby, you are probably thinking, 'oh my gosh what do i do' and dont realize it WILL go away, you are thinking it is something that needs fixed or it will stay that way. At least thats what I thought. I panicked because I thought there was something I was doing wrong to cause this ugly growth. But in fact it was just another stage one has to go thru, so dont worry. It will go away, if you have had it for a while now, it is probably going to be gone within the month. Another powerhead will help too. I had to end up stirring it up and scoop it out with a net because the vacuum wouldnt always pick it up due to the fact that it was stuck on substrate and too heavy, it would just fall back out. So stir it around and scoop your net back and forth back and forth until the biggest part is gone, if it bothers you. otherwise, just give it some more time, and Im sure it will be gone before you know it. Sorry for the 'book' Im shutting up now... lol..