what are these?

[MVrico]

I've had my new tank cycling for about two weeks and tonight I noticed a lot of these tiny tadpole looking things swimming around. I would guess over a hundred of these little things. Can anyone tell me what they are?

the new guy

[gcarroll]

Pods! Basically they are a form of plankton which are beneficial to our captive reef systems.

[1FatBlenny]

i notice that too when i first got my tank.
whatever it is, it must be from the live rock.

occasionally every 2 weeks after the lights go out , my shrimps spawn their hatchlings.