Starry blend pooping sand?

[WhitePanther93]

As of lately I noticed that there’s patches of sand on my rock work. I also noticed sand coming from my start blenny every so often. I never really was looking at the blenny when it was happening so I figured that it just had a habit of moving some sand around as a goofy quirk. But today I got a good look at my blenny as it happened and it was just pooping it out rather than dropping it from its mouth. Anyone else ever see this happen before?

 

[Tang fastic]

Very odd never heard anything about it before but check your local fish store because they usually know the answer