Yesterday I was watching my fish swim around and noticed the water seemed slightly cloudy. I looked in further and noticed the cloudiness wasn't caused by particles, it was caused by some creatures. I immediately though it was planaria, but these were actively swimming around (which I don't think planaria does). I'll describe them to the best of my abilities they look like very small, no larger than 1 mm, they are slightly larger near the front. A white colour, and they swim quite oddly. They do so in a jerking sort of fashion, almost as if they move, stop, move, stop very quickly. They bear a striking resemblance to me to a sea monkey (which I believe is a species of brine shrimp). Having owned sea monkeys when I was younger I've also noticed that they swim in very much the same way. I've been feeding freeze dried brine shrimp to my fish, could this be the cause? If not what do you think they could be? They don't seem to be harming my fish, so I'm trying not to worry too much. sorry, just realized this shouldn't be in the Polypterus specific forum.