Hello. So I thought what I had was cyano but nothing about it makes sense. It grows well in the highest flow areas of the tank. My nitrates were and are still on the higher end (now in the 20s) but phosphate at 0. My lighting hasn't changed. I havent added anything to the tank. I tried chemo clean and ultra life remover for about 90 gallons (tank is 75 plus 20 to 15gallon sump). I even did an extra 0.5 dose of ultralife red slime remover and it did nothing. I've siphoned the samd which gets tumbled all the time by the diamond goby and have done 20 gallon water change. I usually run carbon and gfo along with a refugium but only have refugium running for now as I do chemi clean for the 3rd time not including the ultralife. I did a hydrogen peroxide test and when I took it out of the water it look green so I tried 1.5x dose of chemi clean previously to attack it as if it was spirulina but again that did nothing. I'm all out of ideas. It grows on powerheads, sps (which have taken a toll from being smothered), sand, etc.



