Mysid shrimp in my tank?

[DrugMonkeyRX]

So last night i decided to flash a light into my tank only to see a bunch of these guys swimming around near the bottom of the tank near the glass. I saw 2 of them and wasn't sure what the hell they were. I then flashed the light in-between a dark cave and i saw probably a dozen of them that swam away. No clue how these guys ended up in my tank.

This is what they looked like.

Reefkeeping.com - Video

 

[peasofme]

i fed mine pellets and they reproduced a lot. mine came in on a live rock. they're really cool to watch. i killed all of mine when i rinsed all my rocks in tapwater though.