What am i looking at here ?

[802reef]

Hey all

Reef set up for about a year, i run a small amount of carbon, leds, protein skimmer is tuned in, could probably use more in tank circ but mine is still fairly high... water parameter are good as far as I can tell... ro/di water

I have had a problem with this " stuff " for a while. I just did 3 water changes in a little over 3 week.... 15 gallons on a 90 gallon tank and i.just can't get rid of this. It pops right back within a day of the change..

Are these diatoms or cyanobacteria?

And what's the suggested approach to get rid of them. Thanks all.

 

[griss]

Looks like Cyano. What are your water parameters? Specifically:

Alk
Calcium
pH
Nitrate
Phosphate
Magnesium

Here’s a Thread I had dealing with the worst outbreak of Cyano I’ve had in over 40 years in this hobby and all the stuff. I tried to deal with and, finally, get it under control.