What is this?

Damsel fly nymph / larvae. Native species more than likely. To the best of my knowledge they are not carnivorous like dragonfly larvae, damsel fly nymphs are herbivorous - mostly algae. My guess is you got water / infusium from an out-of-door source, like pond. If that is the case put it in the water source you got it from.

Hope this helps

Thanks! I took some duckweed from my outdoor pond and put it in my tank one time.... that's probably where it came from! Good thing they're harmless.

I won't trust them though with baby shrimp ... that may be too close to their natural food

Quite sure that damsel fly larvae are shrimp killers. I'd stomp that little fella. You can see them in action on YouTube, they're apparently ambush predators.


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Definitely predatory...they would eat juvenile shrimp...in a flash