In my 135gal tank I have six Black Skirt Tetras among the rest of the gang. I originally had three but added the extras to help them behave as a "school," which has worked great! A friend of mine is moving and I told him that I would adopt his two Gold Skirt Tetras. I'm concerned that the Gold Skirts may be just different enough that they won't be included in the Black Skirt school. Will they? Or will they be better off if I purchase 4 more of the Gold Skirts to make their own school? Thanx for your time, and I appreciate any responses.