What are these little critters? Help with ID please

[crazyfishmom]

 

[ISpeakForTheSeas]

Looks like medusa stage hydroids - they typically disappear on their own after a while, but they can stick around if they have access to enough food (pods) or if they're photosynthetic and you have the lights on.

 

[Reefing102]

If you’re talking the little white things, likely hydroid jellyfish. Generally thought of harmless