what did you do to get rid of it?
1. Got myself a microscope. Had dinos and a strange triangle shaped diatom.
2. Got a UV sterlizer and ran the UV for a month and the dino blooms in the water at night went away although the brown matts didn't go away. Just more trangle diatoms then dino cells after the UV.
3. Tested water for nitrates and phosphates they were zero.
Started dosing got P up to 0.10ppm and got N to 5ppm. (tested daily) turned off skimmer.
4. Stopped doing water changes and made sure i was using under 3 TDS water for top off water.
5. Used a hose to suck out brown stuff into a filter sock, spent a lot of time doing it siphoning every part of the rock even under the rock all sides and holes. Cleaned the glass and used clean filter socks after.
6. added dr tims waste away, vibrant, seachem seed. 1/4 dose of each. Made sure the skimmer and the uv was off when dosing bacteria for an hour or two.
6. Did a 3 day black out, made sure i had lots of water flow 3000 gph. Air stones and turned on the skimmer in the black out. (N and P elevated from the black out)
7. Got some hair algae to grow after the black out
8. after growing out hair algae for a month. I would vacuumed all the brown stuff into a filter sock in my sump, every other day seeing any brown nasty stuff showing its ugly face. I dosed the mixed types of bacteria after vacuuming in small amounts.
Added more fish because nutrients would deplete
Started to see more green than brown, strarted to beef up the CUC
And i continued to suck out the brown stuff and dosing bacteria
Notice i had to suck out less brown nasty less and less
Spots are maturing on the rock where the CUC has been munching
Its still not over yet for me but im getting there i think. Trying to promote the stuff i want living in my tank. Trying get the tank in balance where all parameters stay consistent and dont change.
FWIW dont go in blind and just assume its this or that... Testing is the key, light is important also try using more of a blue spectrum.
I also added in a piece of live rock with macro algae and purple coralline aglae sponges and worms, copepods.
Also been dosing iodine.
And only using the skimmer if phosphates and nitrates get to high, keeping it off fir the most part.
Im also consider starting up water changes when its in balance