I am so sorry to hear of the setback,Jendayi. Neptune is back in his cycled tank, even tho he showed some fraying the day before he moved, and a tiny bit this morning.

I am not medicating him, just watching, and hope he will fight it. I do use VitaChem and I do have silk plants and substrate. I waited since Feb to get this tank cycled, so am hoping he will fight it on his own.
Now the other 3g Eclipse is also starting to cycle.............quickly it seems. I started it on Friday with Zymbac, and already had high ammonia and starting to see nitrites.
Storm's tank is not cycled, he has no fin rot and seems in perfect health at this time.
Wink Jack Sparrow is on fins, still in the small 1.66g as I try to cycle tanks and I just added substate to that this morning. He also seems in perfect health. I just spent 10 minutes watching him try over and over again to bite a water drop on the outside of the tank!! LOL

He is so little compared to the other two, I almost expected more difficulties, but luckily, he is still his teeny, tiny demon self!!
I wonder if some of these guys are more prone, or are fighting something from when we first got them

How Storm could go from almost dead to seemingl perfect health without also getting finrot is beyond me.
I would encourage you to do as Rose suggested and hang in there, continue what you are doing. I know Mike suggested to me a long time ago that some fish seem to suffer this fin rot problem, and we have to do the best we can, and try not to stress over it, as long as they seem otherwise healthy. It is nothing you are doing, since obviously you are giving them excellent care. I know I have personally felt so much better since I adopted that attitude, although I am sad for Neptune' that his beautiful tail keeps coming and going..LOL. He is otherwise happy and spunky.
I am supporting you through the net.....sometimes I felt better just writing about it here, and knowing I wasn't alone.!! Take care. Val