Tiny Jellies?

slipperyslope

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The population of these guys has exploded today in my 1.5 gal reef tank. I siphoned some off into a test tube. What are they?
 

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That’s really cool! Neat catch! I’m jealous of such an interesting find. [I just refound my chiton so that’s all I’ve got going for me]

I think you have medusa stages of hydroids; er that’s my take. How old is this little tank?
 
Yepp, Hydroid medusoid. See page 3, post #51 of my microscopy thread. They will most likely disappear after some time on their own. They appear mostly in new tanks, but if you upgraded tanks or moved everything into a new system they can also appear in my experience.

You might also notice some tentacles soon (see page 4, post #61) or these guys (see page 4, post #80). Both can irritate corals which is annoying. The tentacles will probably also disappear on their own while colonial hydroids might require you to become active depending on species.
 

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