So.... I'm updating this thread after all this time... I basically ignored all the dino-scare and went forward as this was cyano. I let it go untreated for about 2 months or even more after this thread ended and nothing ever improved; things got worse (but I didn't take pictures like an idiot). After seeing the thread about peroxide treatment of cyano (I'm sorry, I cannot find that thread, it got closed and nobody posts in it any longer), I decided I would give it a go. I started with 40ml of 3% peroxide (my total water volume is somewhere between 4-450 gal). After doing it 3 days in a row, I noticed that the cyano was in fact getting knocked back, my SPS started looking even better, and no ill effects on fish and other corals where noticed. I upped the dosage to 50ml after those first 3 treatments and dosed just about every day. I dosed at night sometimes, and in the mornings other times (because I'm a true scientist and adding variables is a good thing /sarcasm). Over the course of the months, I noticed that the cyano would knock back and then stall a bit so I developed a rotation and upped the dosage. 60ml every morning for 10 days, water change at 14th day (about 15%) and then repeat the cycle. This showed excellent improvement and I'm very happy to say that my cyano is completely gone as of 2 weeks ago. Yes, I do have other variables that changed in the tank, but I will, beyond anecdotally, say that peroxide did solve my cyano problem.