Jellyfish?

thedeper

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Ok, so I have saw one or two of these little critters floating around my tank the past month and I come in and look at my tank today and I see 3-4 at one time, so I am hoping this is not a problem...

They look like little circles about the size of say a Chromis' eye or a little smaller. As they are suspended in the water they pulsate very quickly (the reason I thought they were a jelly) and are opaque in color. I cannot see any tentacles coming from them though.

Has anyone had experience with this, are they jellies, are they bad? Thanks guys/gals..
 
Ehh the ones I have are almost completely circular and don't really have the appendages that hydroids have.. I wish I could get a picture but the lil buggers are small and are always blown around from my flow.
 
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