Saw these at what I consider to be probably the most reputable lfs in my city. I'm 90% certain that their dyed. The come in about 4 different colours. Bright blue, green, pink and orange. Can someone verify for me that there is no natural breed of "Mixed Fruit" Tetra's. I would have said something, but I wanted to make sure. If so I'm pretty disappointed in them for having them. Their the best lfs in the city, take good care of all their stock, tons of plants and supplies.