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Could be fin rot.
It looks like fin rot to me as well. But it could have started from an injury!?
Ok I'll try stepping up the water changes for a awhile. I'd rather not dose anything if I don't absolutely have to.Lots of water changes is first thing that might help it cure. Frequent 25% changes or so, in a distance of a few hours maybe.
If that doesn't work within a few days, try salt (not entirely sure but aquarium salt I think, someone confirm or infirm this please).
And if all else fails, try melafix or betafix. But be careful as it may hurt their air breathing organs.
Fish fins heal extremely fast.Ok I'll try stepping up the water changes for a awhile. I'd rather not dose anything if I don't absolutely have to.Lots of water changes is first thing that might help it cure. Frequent 25% changes or so, in a distance of a few hours maybe.
If that doesn't work within a few days, try salt (not entirely sure but aquarium salt I think, someone confirm or infirm this please).
And if all else fails, try melafix or betafix. But be careful as it may hurt their air breathing organs.