Cyano problem?

[Cal_stir]

i battled dino about a year ago, i thought it was cyano as it was a reddish purple colour, it was stringy in areas of low flow, the strings were full of bubbles, the bubbles were all over the place, every morning i thought it was gone and every night i was shaking my head, it was choking out my corals, i did lights out for 4 days, reduced flow, raised alk to 11dkh, no water changes, wet skimmed, changed socks daily, after lights out period i turkey basted the rocks and corals, vacuumed the substrate, resumed regular flow and water changes and it never came back, i now run a sulphur denitrator to keep my nitrates less than 1ppm, my nitrates were 25ppm prior to outbreak but read 0 during outbreak.
i battled the dino for about 2 weeks before i realized it was dino and at one point i was ready to give up because i didn't think i was going to beat it.