what is this and how to deal with that?!

[Bigair]

is it black hair algea? my 150l tank is 3 years old and keep no3 at 3-5, fishes and corals are all happy except myself due to those ugly wide spreading creatures, my tang does not like it. they are now allover stones and sand exposed to the light. any idea?

ca 420
mg 1300
kh 10
ph 8
no3 3-5
salinity 32%
si 0
phosphat 0.1

 

[MERKEY]

That's interesting, it almost looks like cyno but on the hair algea causing the black color.

@vetteguy53081 what do you think?

 

[vetteguy53081]

is it black hair algea? my 150l tank is 3 years old and keep no3 at 3-5, fishes and corals are all happy except myself due to those ugly wide spreading creatures, my tang does not like it. they are now allover stones and sand exposed to the light. any idea?

ca 420
mg 1300
kh 10
ph 8
no3 3-5
salinity 32%
si 0
phosphat 0.1

Looks like a type of cyano structure that mats easily but is non-rooted like GHA and should blow off easily with a turkey baster and can be netted or siphoned right away so its not allowed to spread or place rock in a container of tank water and pull or scrub off and then increase flow slightly and add cleaners such as Citon, astrea, cerith and ninja star snails, pitho crabs, Caribbean blue leg hermits which are tiny.

 

[Bigair]

Thank you I will add more flow rate and bring in more cleaning team