wat is this

kyle

Reefing newb
i found a "snow flake" looking thing on my glass today.srry i dont have a pic. i was reading a thread about 2 weeks ago that was simalir. does any one have an idea wat im talking about. are they bad or good wat can i do to stop them from reapearing. thanks for the help
 
like i said i dont have a pic. but i think yote is right. they said they were hydroid jellies in the thread i was reading before and their was a pic on the other thread and they look very simular thanks yote
 
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