That's strange. I, too, have noticed something like this for the last two nights. I think mine may be a little different though. I switched out my CC for LS on Sunday. The last two nights I've seen this jellyfish looking thing in my tank. It's clear, and it's body is like that of a tulip that opens and shuts. And the "legs" look like a "V" shape. I swear I thought it was a jellyfish. But its small. I can see it without the magnifying glass but couldn't really tell that it was "opening" up like a tulip without the magnifying glass. I'm no expert on these things so maybe one of the "sharks" here can help identify these creatures. I did question before the several copepods that I had in the tank (seem to have lost a lot of them when I switched over to the LS). And ideas what these creatures are?