Weird jellyfish baby showed up in my tank?

[DiscoHobbit]

As per title:

I noticed this thing on my back wall, maybe 2-3mm in diameter. When i scraped it off and caught it, i made jellyfish motions.
after being free swimming its now on the glass again staying in place

 

[reefing102]

Looks like a hydroid jellyfish. Generally considered harmless and will usually go away on their own in my experience.

Critter Identification: Hydroid Jellyfish – First Time Fish Keeper

f you are seeing tiny star-like organisms on your glass, they are likely to be Hydroid Jellyfish. They sort of look like very small Aptasia, or a snowflake or even baby star fish, they are not really much bigger than the head of a pin (1-2mm max).

firsttimemarinekeeper.com

 

[shred5]

Yea I have seen them a few times especially if I got new live rock. They end up going away.
Never seen them swim though just attached to the glass.

 

[DiscoHobbit]

Age so no cool medusa jellyfish soon? Bummer!