Algae identification & help to eliminate, managing low nutrients

PiscesPower

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My 26g AIO tank has been up for 6 months. I have a 3g HOB refugium that has Chaeto and some red gracalerria. I also run a skimmer to pH management using a CO2 reactor. Mixed reef mostly LPS and a few easy SPS and softies.
I'm not a new reefer but don't consider myself expert.

I feed a variety of foods and I have been dealing with this fast growing algae for about a month or so. Mostly on equipment and back glass, with some on rocks but I have a robust CUC, and I am getting light brown algae on the sand but not excessive. I am pretty sure its not Bryopsis, I don't see the ferns when I put it on a microscope slide. I was not able to actually view it through the slide as the microscope is broken. The CUC which has various crabs, urchin, lettuce slug and cerith and trochus snails mostly, I see the crabs, urchin and seal slug pick at it but no one is going to town on it.

I run both tridents and have had the NO for just a few weeks, and I have run the calibration.

I have the conundrum of which is responsible for the other, because I need to identify so I can treat. More food, less food, more water changes, fewer water changes(you get the picture here). I've never had an algae free system but this stuff just seems to persist. I have never had seriously high nutrients, I think the highest my PO4 has been since starting is .15 and NO3 always under 10 (this is with Hanna and not Trident NP and they do correlate.

I am hoping to get an ID of it, and maybe some suggestions on what is the way to proceed with getting my system back to a more balanced state. I have 5 fish in the system: pair of clowns, tailspot blenny, cardinal, and a mandarin, which is why I run the fuge. I have a lot of corals, and a clam they all appear happy and healthy. FTS at the end. algae3.jpg

Major elements have been stable for a few months.
So parameters today:

pH: 7.96
Temp: 77.9
ORP 309
salinity: 1.025
Ammonia: 0 Hanna
Nitrite: 0 Hanna
NO3: 4.5 NP
PO4: 0
Alk: 9.42 Trident
CA: 381 Trident
MG: 1416 Trident

All right I have posted all I can think of, here are some pictures in the white light.
Am grateful for any push in the right direction.

algae1.jpg algae2.jpg graph.jpg zoomed in.jpg algae3.jpg fts.jpg
 
is it on rock? you can pull and dip in peroxide. softies/lps are typically fine, just no sps.

surprised your urchin isn't eating it.
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

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