little jelly fish looking things!!!

So my tank cycled. The pods started exploding then these guys showed up all over the glass. They look like jelly fish but in hundreds sticking to the glass! Are the bad, good need advice and what they are. Thanks tor any help
 
cant find any pics after a while of searching the google. so here is my expert rendering of the thing in question.

<a href="http://s37.photobucket.com/albums/e64/Brewski4u1/?action=view&current=untitled-3.jpg" target="_blank"><img src="http://i37.photobucket.com/albums/e64/Brewski4u1/untitled-3.jpg" border="0" alt="Photobucket"></a>
 
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