He's popping them to see if the hemipenile casts or sperm plugs come out.

Op it's really common for them to ingest small bits of subsadrate. I personally don't think you'll have anything to worry about. You may want to keep an eye on him though. Is there alot if sub in his vent? It may also be from when his hemipenes were out an about bits of sub just getting stuck.


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