I saw a sand crab looking creature in my wormstrate tank a couple weeks ago, it was near the top if my pebble gravel it appeared to be eating. I thought it was weird but didn't think to much of it. I go to empty my canister filter and I found several of these same identical creatures squirming around. I would appreciate ID just for my own understanding and to see if they are a potential threat. Thank you heres a picture.
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