Could this be cyano? Just appeared today, it’s bright bright purple (the dark purple is epoxy). Tank is 2 months old, lights have only been on a few weeks. The green is, I believe, phytoplankton growth—been dosing those aggressively for the pods. Had diatoms and they started dying off a few days ago, leaving black hairy stuff. This purple stuff is making bubbles just like the diatoms, unless it’s really coming from the phyto. Have not introduced coral yet so don’t think it’s coralline, unless it could hitchhike on this macroalgae…Could it be diatoms in a different stage of life?
The weird thing is that it’s not on the sand at all, though I do have great sand cleaners. It’s also not on the lowest-flow rocks in the tank, but the rocks highest up. It is not on the high flow areas either though. Been running the skimmer on and off. Parameters before water change 2 days ago:
Salinity: 1.027 (got it back to 1.025 now but it was too high for a week)
Nitrate: 15-20
Phosphate: .03
Ammonia: 0
Nitrite: .05
pH: 8.2
The weird thing is that it’s not on the sand at all, though I do have great sand cleaners. It’s also not on the lowest-flow rocks in the tank, but the rocks highest up. It is not on the high flow areas either though. Been running the skimmer on and off. Parameters before water change 2 days ago:
Salinity: 1.027 (got it back to 1.025 now but it was too high for a week)
Nitrate: 15-20
Phosphate: .03
Ammonia: 0
Nitrite: .05
pH: 8.2