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Oh man, a comb jelly?!The coolest hitchhiker I've found is a comb jelly. It came on the underside of a plate coral and would stretch out a long tentacle at night.
I've also had a couple different stylophora corals hitch hike in.
I also really like some small nassarius snails that came in from somewhere and multiply like crazy. They biggest are a little under 1cm long and most are closer to 0.5cm long. They do a great job of keeping my gravel clean.
How long did you manage to keep it alive for?