Hello and welcome to TFK
A few notes on the fish that you currently have in the tank. Convicts are a very nasty fish especially when they are spawing and raising fry. They have been known to defend their territory against oscars that are up to 3 times their size. They are great parent raisers but they can be a difficult fish to keep within a community type setting is the space is not large enough and also depending on the fish kept with them.
For the Tiger barb these fish are notorious fin nippers and actually need to be kept in a larger group of 7 or more. Larger groups does tend to help keep their fin nipping tendency within the group. Not sure what type of fish you mean by red fin barb, and on the tetras it could be either red phantom tetra or red eye tetra.
The pale coloration that you are seeing in the fish I believe is probably from stress and the torn fins from the barb is probably from one of the other barbs, or possibly the convict if it was existing before the convicts had been seperated from spawning, which I believe you said was done in another post.
For the best of the fish and also to help to keep you from experiencing frustration down the road, you need to reconsider the fish that you would like to keep. You can find more information on the fish from the tropical fish profiles, which is found at the top of the page second tab from the left. Also you can click on the shaded name to pull of the profile information.