Fridged axie- is this sand?

[NexSocius]

I have a rescue fridged at the moment, I suspect she was on sand and could be impacted. She hadn’t eaten for 2 months and was ammonia burnt when I got her.
Anyways, this was in the tub after day 1 of fridging, do you think it is sand or something else?

 

[Hayleyy]

That does look like sand to me, fridging seems to be working

 

[NexSocius]

Thanks, thought I was imagining things lol!