Hey, I'm sorry for such a late reply, TBear! Yeesh. Sorry about your issue with your gouramis, man.
I'm pretty sure that teared tail is from fin-nipping on my longfin, as now I'm seeing what looks like scar tissue, and the others are chasing him all the time (he's chasing the others too, of course). The aggression in there is just ridiculous right now, so I'm trying to add more as soon as possible.
I don't know much about gouramis, but I thought they were some of the most peaceful ones out there? I guess not, based off of your experience.
And as far as your salt treatment goes, though I'm sure you've already handled it, my heat (around 84 degrees Fahrenheit) and three tbsp of salt worked really well; haven't seen any more issues in a while. But, I definitely wouldn't go off of my experience; fishkeeping isn't an exact science, I've learned. Lol
How's your tank going since you posted?