Is this bacteria blo9m or Algae or something else?

[Singspot]

I have a 240DT in a total 300g FOWLR. I started adding 7ml nopox 2 months back to control nitrates (my phosphate is near-0, I use gfo) but nitrate climb to 50 in 1 week after water change (30%) ..so i up the nopox to 6 ml noon and 6 ml night for last 3 weeks.

Any suggestions on what this is ans what could i do in my f9wlr to kill them?

I keep lights on only from 3hours peak and total 5 hpura only.

I do not recall when this stuff atarted growing on my rockw but it has been here for 4 weeks for sure... qnd growing fast ... i do notnhavw algae eating fish. .. i had a great lawnmower blenny but my green bird wrasse killed it (on the camera while i was unaware ans filiming my tank, so sad) .. no other fish bothered the blenny (2.5 inch and ate algae all day for last 1 year) but my green bird wrasse murderously chased the blenny once in a while for last 3-4 months. .. i saw him do it 3-4 times ... now i am worried my wrasse (10inches and pig) eill kill any blenny ... else i would love to put starry blenny and a midas yellow blenny .. do you think i should try keepijg the blenny again Iits been 3 months since my lawnmower died...

 

[JGT]

I have a 240DT in a total 300g FOWLR. I started adding 7ml nopox 2 months back to control nitrates (my phosphate is near-0, I use gfo) but nitrate climb to 50 in 1 week after water change (30%) ..so i up the nopox to 6 ml noon and 6 ml night for last 3 weeks.

Any suggestions on what this is ans what could i do in my f9wlr to kill them?

I keep lights on only from 3hours peak and total 5 hpura only.

I do not recall when this stuff atarted growing on my rockw but it has been here for 4 weeks for sure... qnd growing fast ... i do notnhavw algae eating fish. .. i had a great lawnmower blenny but my green bird wrasse killed it (on the camera while i was unaware ans filiming my tank, so sad) .. no other fish bothered the blenny (2.5 inch and ate algae all day for last 1 year) but my green bird wrasse murderously chased the blenny once in a while for last 3-4 months. .. i saw him do it 3-4 times ... now i am worried my wrasse (10inches and pig) eill kill any blenny ... else i would love to put starry blenny and a midas yellow blenny .. do you think i should try keepijg the blenny again Iits been 3 months since my lawnmower died...

Looks to be Green hair algae. Manually remove/siphon out, check NO3 and PO4 are in range, lessen feeding, shorten light intervals, add CUC if you don’t have and a tang or 2 depending on tank size and lawnmower blenny. Be patient. Will take time to eradicate.