They look just like Endlers. Though their colorings are blue, pink, yellow. They could be hybrids - Endlers x Guppy? Whatever they are, I don't think the water is 18+ celsius so they are doing well in the cold water.
I'll have to get a better photo of them. About 3-4 out of the 5 have swords (their tails) ... they don't have the fancy guppy kind of tail. Only the yellow one has a fancy guppy like tail but it's nowhere near as big as a fancy guppies tail.