Thanks for the reply. Bizarre!! I've never seen anything like it, except maybe in swamp water. Freaked me out! Thought maybe my tank had bad water quality or had been contaminated somehow (its an office tank). Had bettas breed in it last week and now have alot of tiny betta babies. Anyone know how long I should keep their daddy in with them? Or how long before I can get the tank back up to its original status? I figure about two weeks, but would like some info from someone who's actually done this before. Thanks.