Well, I am really REALLY sad to say it did not work out.
I had noticed a couple of fin nips on the Polli and Teug but had been watching and had seen no indications of anything out of the ordinary... so tried to calm down about it. I had read about puffers "trying" something to see if it was food and was hoping that maybe that had happened at night.
Went out of town for a few days, came back last night. No one looked horrible, but then I specifically saw the puffer go over to the Polli and chomp on her tail. So needless to say he's in the 10 gallon right now.
I don't know why he specifically was going after the Polli and Teug. The Del and Moke, butterflies, tetras, and plecos are completely unscathed.
Whatever it was, he can't be in my tank. I think it would have been fine in a tank without those specific 2 fish. It seemed happy in my heavily planted tank, loved hunting the snails.
I AM SO BUMMED!!!!