ID Help - Possibly Dino?

[nim6us]

Under the microscope they’re mostly giant mats but I isolated one on it’s own. I've looked under the microscope multiple times and the shape and color looks like dino (coolia specifically) but I can never see them moving. They look dark red mats in the tank and it’s only on the sand. I thought it was cyano but neither Chemiclean or Ultra Red Slime remover worked.

Any ideas? @taricha I know you're a pro if you're around?

 

[saltyhog]

Looks like coolia. When in big mats I've found the ones at the edges move but the denser areas don't. This is a video I took a year or so ago.

 

[nim6us]

Interesting! To be fair I've only got a few patches, they haven't been expanding but they haven't been receding. Thanks for the extra info.

 

[taricha]

My guess is it's a resting cyst (of some dino).
more pics for context may help, but if none move - then that's gonna be my best guess.