Good or bad?

[gdfpm1247]

Looking for identification. This has been moderately spreading across the sand bed. I haven’t messed with it much. It looks to be a hard algae like coralline but not sure? Anyone have any ideas? Thanks in advance!

 

[hijinks7]

It looks like cyanobacteria. Not enough flow and too much nutrients in the tank. You can try a 3 day lights out period and cover the tank with a blanket so no light gets in from the front.

 

[Tallison]

Looks to be Cyano

 

[Big G]

Looks like cyano. Only way to be sure is to put it under a microscope.

 

[jsker]

Cyano, check and reduce your white light spectrum to 5 hours total daily

 

[gdfpm1247]

Ok thank you all very much!

 

[gdfpm1247]

Should I siphon it up during a water change? Or just leave it with the reduced lights?

 

[I3enny]

Suck it out and watch it grow back in a few days... Leave it in and watch it spread over everything!

 

[mjlash22]

Phosphates and nitrates are probably high. Have you tested recently?

 

[Lninwa]

Is your tank young?

 

[Reef-junky]

Are you running a skimmer? Light out and skimming is the way to go. You need more flow for sure.