As long as there are no aggressors in the tank they should heal at a pretty fast pace. I have had a couple fish that tore fins on my vlamingi and koran (got rid of the aggressor) and they will heal over a couple weeks or so. I don't know if I buy into the carbon theory, but I figured better safe than sorry with that. Another thing I do is add selcon to my frozen food mysis, or emerald entre. Also garlic extract. You can get selcon on the internet and garlic extract at pretty much any LFS it will last a long time. I would pick up nori and feed that on a clip 2-3 times a week. From what I understand, the nori actually yields better nutrition for fish than vegetable matter from our world.