Okay so I haven't had a cyano outbreak for months up until a few weeks ago. I put chemi pure elite into my filter with direct flow and its been running for a month which should be taking care of the phosphates & silicates ( it says to change chemi bag once every 4 months). It's been 3 weeks since my feeding has decreased dramatically since my fish are all being quarantined in a seperate tank for ich. I have been doing the Vodka method, adding Nite Out II, and doing peroxide injections onto the areas of cyano growth. For some reason they keep growing back within 2-3 days. Usually when I combine these methods, growth halts and is totally wiped out for a very long time. I'm feeding my snails/crabs only 1 pinch of frozen emerald entree 1-2 times a week and my reef capable lighting is on 8 hrs per day. I'm wondering since I lowered my powerhead flow slightly if this may be the cause but I don't think this should be the issue. My phosphates, amonia, nitrates, and nitrites are reading 0. Any ideas?