There is 3 of them... And they are all the black with white tips on their fins... Strange little things.. They are not much bigger than guppies.
I found them in a drying up section of our local river - in the filthiest water I have ever seen... I couldn't believe anything could live there but we found the guppies, crayfish, shrimp and these little fellas in there... We were originally looking for tadpoles!!
Everything we got from there is now thriving in our aquarium
our crayfish shows no interest in them at all. He just does his own thing!!