Several oval shaped creatures (about the size of two pinheads) keep appearing in my guppy tank (4adults and about 50 babies), I noticed them about a month ago because they left a little worm trail on the glass. I cleaned the tank and removed the two from the glass by pushing on them(they popped 
yuk!!!) at any rate I have watched the adult fish very closely since but there has been no sign of disease of sickness of any kind. everyone seems very content. They have come back twice since, one in there now. I could really use some info, I would hate to lose those little guys. I have 5 other tanks and have never seen these before. Plan to try to do some research but don't know where to start other than here. Thank you so much for your input 
cutiefish
yuk!!!) at any rate I have watched the adult fish very closely since but there has been no sign of disease of sickness of any kind. everyone seems very content. They have come back twice since, one in there now. I could really use some info, I would hate to lose those little guys. I have 5 other tanks and have never seen these before. Plan to try to do some research but don't know where to start other than here. Thank you so much for your input cutiefish
