Fin-Nipping *UPDATE VIDEO OF FISH*

[Flatcoatluver]

Here is a video for them.
http://www.youtube.com/watch?v=MulRgWbcnd4

[IRescue452]

Platys and tetras are known for fin nipping. Tetras are also schooling fish. In the absence of a school, they can become nippers due to stress. You really should get them a few friends. 4-5 of each type of tetra is much better than 1. Platies are just plain aggressive, but they aren't schoolers. Don't get any more platies.

I could not see your video, but mixed fruit tetras are injected with dye. This process results in pain, occasional internal problems, and sometime death. The fish lose their color in a few months. Often it reduces their lifespan by half. I'll assume that it is a white skirt tetra with dye, as I can't see, so it may or may not school with other skirt tetras.

[Flatcoatluver]

Don't worry Irescue you have already told me about the dyed fish many times, I won't get any more. I was told when I get a whole bunch of different tetras that they would school together. So I followed there advice. I guess I was wrong to do this. So I moved all 4 of them in a 10 gallon. Is there any more room in there to add more tetras, or should I even add anymore?

[IRescue452]

You have small tetras, you could add a few more without problem. A lot of aquarium hobbyists love to stock lightly, but you're fine with space and biological stocking.