Did you add a bunch of new rock?
How long are your lights on? Or is there any sunlight hitting your tank?
I agree looks like hair algae. But either way your phosphates are too high algae feeds off of high phosphate levels. What kind of clean up crew do you have?
Well the rock came from another tank. It was established.
There isnt any sun that directly hits it.
I just swapped the marsaqua lights over to sbreef and turned down the white channel.
The sbreef has uv lights so i hope that helps.
Im also running a brs dual reactor with carbon and photsban i believe its called.
But i havent noticed anything changed since ive had the reactor running.
On my phostphate test im getting .25.
No nitrate or nitrite and 0 ammonia eith redsea kit.
I never had an algae probem with my 75 gallon.
I had probly 10 snails but alot of them died. And im not sure why.
I currently have about 4 left. 2 turbos and 2 others.
I had a couple of cleaner shrimp and they died also.
But my fish are healthy and growing.