Ok, it's been a bad couple weeks for my reef tank. Over the last 2 weeks I've had a horrible ich outbreak (damn powder blue!) that has basically wiped out my fish. I was able to get my last 2 fish (clown and wrasse) into a copper treated hospital tank. Clown died a couple days later. So, while my DT is cycling out (with no fish) the ich, it seems like a good time to work on my cyano problem as well. I've read much on this topic and there is much debate. I finally decided to attempt the method outlined by Thiel, using Redox + Liquid. But, now I can't find where to purchase this solution. A little about my tank: 90 reef gallon DT, 20 gallon sump, 5 years old, AquaC EV-180 skimmer, 3 Koralia 3's, Mag 9.5 return, GFO and Carbon reactors (added 3 weeks ago), 692 watts of light (actinics + 14K, 6 months old), large CUC of snails/hermits/emerald crab. No fuge, unfortunately. Water changes twice a month, totalling 20%. I've had to up the WC's lately for my hospital tank. Parameters: CA 425, ALK 9.15, MG 1340, Nitrate 5.0, SG 1.024, Phos 0, Temp 77-78, lights MH on 9 hours Actinics on 12. Theil seemed like he had it down, but I can't find the Redox + Liquid. I've experimented a little with cutting the lights and manual removal, but the cyano returns after I bring them back up. I did replace my crushed coral with sand about 3 months ago (1.5-2 inches thick), could that be contributing? Any thoughts?