Planted Tank Guru
Join Date: Jan 2010
Location: Contra Costa CA
Where the Gourami nipped them there might be some fungus getting started.
At this point I would make sure the water is extra low in nitrate, and vacuum the floor of the tank to remove fallen food, poop, dead leaves or any other organic matter.
The fish might be able to fight off the fungi themselves, or you might need to medicate. At this point you could add a mild medicine like Melafix and Pimafix. They work well at the very beginning of a problem, and work best when the organic load is less (That is part of the reason for vacuuming the floor of the tank).
I have used these on my Angels and there were no problems. My long fin angel used to get those little white tufts every now and then. I have seen posts of problems with these meds when used with Loaches (but not all Loaches, some Loach keepers use these without issue), and Melafix is labeled not for Bettas (so I do not use it for any Anabantoid).