So, not sure what on earth is going on with these guys. Are they "natural enemies"? I couldn't tell if the urchin stuck the hermit crab on him as decoration, or if the hermit crab was trying to attack the urchin...? The urchin looked like it was fleeing and the hermit crab was dangling off of...

A friend helped me ID a pest (or 50 of them actually) which was starting to overtake a green striped mushroom rock which also had a ton of very colorful feather dusters on the back. The pest was the dreaded the vermetid snail. Why do I say "was?" Because, a pair of halloween hermit crabs and...