Probably a dumb question, buuuuut...one of my peacocks has a piece missing from his dorsal fin. I think this is from an altercation with Incognito (mbuna). I ha e 2 mbuna and theyre both gone as soon as my lfs has room for them. Maybe sooner.
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It will grow back in a week or two it's normal among cichlids as long as it doesn't get too bad he should be fine. There is almost always 1 or 2 of mine who have a little fin nip if it gets bad though get him out if possible to heal up. And I don't doubt it was the mbuna. I removed mine and put them in their own tank because I was sick of them nipping my peacocks.
Melafix will help the fins grow back faster. Nipped fins happen. It's irritating. I have had several times where as soon as the fin is finished healing it gets nipped again. Maintain good water quality though because damaged fins can lead to fungal/bacterial infections.
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It says to remove activated carbon, and if you were treating for bacterial disease id say 100% do it. But I have used Melafix with carbon for fins. It still has an effect, just not as good. Up to you.