Is this GHA?

[abecker]

 

[twilliard]

Hard to tell in that picture but IMO no
would have to see a more focused picture

 

[abecker]

 

[abecker]

This is a picture of similar algae on the sand.

 

[twilliard]

Bacteria or dinoflagellates

 

[Reef_Collector28]

Not GHA, looks a lot like it is dinoflagellates

 

[abecker]

Dino's is what I am thinking now. I see little air bubbles appearing. It's a fairly new 25 gallon tank. What would be the best option to remove them?

 

[Kyle Seeley]

When my tank was new I went through a really bad Dino outbreak. I went on a 4 day no light period and didn't feed for a week. They disappeared right after that. Not sure if it was luck or maybe a coincidence but it's something you could try!