Need help to identify this stuff... I've had this brown algae on my sand ever since I started this tank over a year ago. I've gone back and fourth on whether it's diatoms, cyano or something else. The tank is not in direct sunlight but is in a fairly bright room that gets morning light and that's when this stuff shows up every morning.
I've gone through a couple chemiclean treatments with no effect whatsoever thinking that it may be cyano.
Water changes have little to no effect either. Once or twice it was even worse the day following a water change.
The only thing it responds to is lights out for a couple days. But it always seems to come back. Photo below is a couple hours after sunrise with lights off.
Nitrate: .25
Phos: 0 (Hanna Low Range)
Alk: 7.9
Cal: 415
Mg: 1410
I've gone through a couple chemiclean treatments with no effect whatsoever thinking that it may be cyano.
Water changes have little to no effect either. Once or twice it was even worse the day following a water change.
The only thing it responds to is lights out for a couple days. But it always seems to come back. Photo below is a couple hours after sunrise with lights off.
Nitrate: .25
Phos: 0 (Hanna Low Range)
Alk: 7.9
Cal: 415
Mg: 1410