Well, I’m a real aquarist now! I’ve spotted my first hitchhiker on a few small pieces I just got. My tank finished its initial cycle and I bought a few cuc and small live rock pieces for mantis to play with when she arrives (cuc is also special welcome home treat for the mantis). Anyway, went to put a piece in and the rock moved! And this guy has moved in! Thank you for the common hitchhiker guide so now I know what kind of snail it is!