I found this in one of my planted 20L tank with ramshorn snails. No fish, it should be cycled, but I plan to do either shrimp or put my rainbow shiners in there after quarantine. After looking through the hitchhiker thread, is this a dragonfly or damselfly larvae/nymph? It is at most 1 inch, green, with 6 legs. I found it when rotating one of my moss balls. About a week ago I saw a snail shell without a snail and now I wonder if this guy was the culprit.