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.
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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?
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