Good job! That was it so bad was it? In my shrimp tank are/were at one time detritus worms, planaria, hydra, seed shrimp, Copepods, limpets, and snails. There are no fish in there so that may account for the presence of some of these critters.
I used to find small leeches while cleaning the filter at a pond at my folks house years ago. I don't think they were the blood sucking type. There are omnivorous types that feed on plant matter and what not. I did have to check my feet and calves for and that decided to hitch a ride.
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