Help! What is this??

[clownfish111]

Hi,

Newbie here. I setup my first saltwater tank 4month ago, I started to see this dark algae-like thing (please see photo and videos below). Can someone help me identify this and how to get rid of it? Thanks a lot

PS:
I brought the Vibrant cleaner, it makes the water clear but doesn’t seem to work on the thing here

tank:35 gallon (fish only with live rock )

appreciate your help

 

[T-J]

I'd just vacuum it out. I also don't recommend tossing Vibrant into such a new tank.

 

[Rmckoy]

That black stuff in the sand ?
Vacuum it out . If I remember it smells terrible similar to a sulphur smell .

 

[tmccaff]

No vibrant! seems like some sort of algae. Could be Cyano thats what it looks like. It's normal increase flow a bit see if that helps.

 

[clownfish111]

Thank you, guys. I tried to siphon it out, it always grows back. I start to suspect it might be Dinos. Video doesn’t work, I’m attaching more pics.

 

[T-J]

Thank you, guys. I tried to siphon it out, it always grows back. I start to suspect it might be Dinos. Video doesn’t work, I’m attaching more pics.

Not dinos.

 

[vetteguy53081]

Often this happens with new/newer tanks. As suggested vacuum/siphon and see how soon it returns.
Often tap water, silicates in the sand or lack of flow are contributors