What is this...Byropsis or GHA???

[Huskereef]

I haven’t added anything to my tank in a couple weeks and this hair like algae started to appear in the last 3-4 days.
Spreading rather quickly.
I’m about 80% sure it is byropsis but hoping it’s not!
Tank is only 6-7 weeks old. This algae seems to only be growing in the sand bed, hasn’t really bad its way on to the Rocks yet. Lmk what y’all think

 

[Ultra Aquatics]

Yep that looks like bryopsis to me. It appears to have the classic “fern” like structure. I would suggest fluconazole. When I eliminated mine I used Reef Flux HD.

 

[vetteguy53081]

Bryopsis
I have had success using Liquid vibrant to get rid of it. Fluconasal at 20mg per gallon for two weeks also works