I am talking about the 3 mix fruit tetras I have in a gallon fish tank. I was suggested to get a bigger tank, but I don't have the space. Now it worries me that my fishes could be unconfortable or can get sick or something... I don't know.
I hope I didn't make you feel bad. Years ago I remember asking my mom why the painted glass fish where so colorful. She said (and honestly believed) that they had literally been painted (with a brush) It's not your fault at all that you bought dyed fish. The LFS should inform you before you buy them. And in my humble opinion it is not your fault that you have them in a one gallon tank. They should have asked you your tank size aswell as told you that they like to be in groups. best of luck rosy =)
You should not be keeping a better in a 1g tank at all check in the betta forum at what they should be living in.