Such a pretty and interesting color. Did you do your water change yet?
If not, my suggestion is to do a series of water changes after discharge is seen. In my experience, I was lucky enough to catch mine doing that when first in my tank. I caught it doing it again a couple of days after that. Otherwise, I would have never known what was going on.
I imagine that what you see is only a moment of what can be going on throughout the day and night a little bit at a time. I also noticed a slight 'off' smell to my tank water after witnessing these events and prior to water change. If you have ever smelled sps out of the water, it's similar to that and can be subtle. I have a habit of smelling my tank up close when I sense there may be something wrong with my anemones.
One time I caught it happening and quickly siphoned directly from nem's mouth to bucket. The water in the bucket smelled horribly.
I also agree with others that feeding shouldn't be a priority right now. If it will make you feel better to see a feeding response, I would also suggest very small foods.
The mouth looks gaping, but has pretty good tone around the rim. I would interpret that as meaning it still is strong enough. It could also mean something is going on with it's foot, whether it's not firmly planted yet or damage from removal and transport.
Are you acclimating the lighting? My knee jerk response when seeing the pictures was to give it a little less light....either by raising your lights or using a screen or eggcrate. I really have no good reason why to tell you to do that, other than that was my gut reaction.
Good luck!