I hae had this 50 gallon tank running for over a year now. It seems like the Diatom Bloom never went away and only got stronger. Did I make a mistake by curing my rock in a dark bin for 3 months before the tank was even setup? Up until I ran a GFO reactor the algae was just everywhere and impossible to get rid of, it was gunky and slimy ..very nasty stuff. My water chemistry has been stable, at least for what I can test for (CA,MG,ALK,SG,pH). CA 420 MG 1440 ALK 8.2 SG 1.024 pH 8.3 Once I added the GFO reactor a couple of weeks ago, I have noticed how the brown gunky slime has been disappearing from the rock surfaces slowly, in patches in certain areas, but the stuff doesn't go away!!!. However the fact remains that my coral still struggle to overgrow this stuff. My Lawnmower Blenny and my handful of snails + 3 hermits are just not a competition against this stuff. Also, I have noticed that the tank is growing coralline algae like crazy. (I have tried scraping this stuff to get it to grow on the rock, but so far I haven't seen any noticeable growth. The GFO reactor has been up for a month now and these are my water parameters at the moment: CA 395-410 MG 1400 ALK 7.9 SG 1.024 pH 8.1 I perform bi-weekly 15Gallon water changes. I was about to change the GFO reactor with new GFO and I wanted to add some carbon. Any ideas on how to battle this stuff? as you can tell my GSP has struggled to grow, this stuff doesn't allow it to, this GSP frag has been in the tank for about 8 months... NO GROWTH!! why???