Well im also one of the proud owners, if i can say proud cause i have no idea what it is, i put it under a microscope and there it was, a little jelly, with tentacles and all, when u see it in the tank its so incredibly small that basically it looks like a couple of white dots doing a jellyfish motion, i would love to get a picture but it only comes out when i turn my filter off, if im lucky, havent seen it much, but there are at least 3 in my tank that i've seen swimming around at the same time, pls pls tell me what it is or at least what u think it is....im desperate i've looked all over the internet and all i could find was a very deadly microscopic jelly that has killed three people already....should i be worried?