He's a crowntail, and he somehow managed to get just one of the spikes cut off of his fin just now. No idea how it got cut off by a soft, silk plant, but it did. That's where I found it, stuck to the softest plant I could find in the store.
Now, should I treat him with anything or not? I would use salt baths, but he isn't very tolerant of salt, any amount seems to stress him. Or would keeping his water clean be enough.