Interesting find in clumping sand

[Keko21]

So I noticed my sand has been geting kind of clumped and snotty. At first i thought it might be a resurgence of amphidinium dinos so I busted out the trusty microscope to confirm.

No dinos. YAY! But I was very surprise at what I did find- some sort of branching algae growing between the grains of sand and “tying” them together!

Has anyone else ever seen this?

 

[Timfish]

Yeah, but not very often. I siphon it out and either toss it or soak it in H2O2 before reusing.