Help Identifying

[Fishboy9227]

 

[Fishboy9227]

This stuff is growing on my back wall, rocks, and a little on the sand. P04-.05ppm, N03-1-2ppm.
Lights definitely spur it on. Tangs won’t eat it.
Any help is appreciated!

 

[Fishboy9227]

 

[Fishboy9227]

Bump. Could use some help.

 

[Dan_P]

Bump. Could use some help.

It looks like algae. I have seen this type where cell walls are visible. I have also seen a type where the cell walls are not obvious. The two types might not be equally appetizing though they look the same.

 

[Fishboy9227]

Thanks for the reply, Dan.

I performed the H202 test last night (2 cups of water, 1ml of of H202). No water discoloration or breaking down.
Interesting