midnight angel addition

[GongShow]

I'm acclimatized a midnight angel using the drip method for about three hours and i put him into my quarantine tank and he was doing fine for about 5 hours now he is swimming up to the top of the water and sticking his mout out the water and gasping for breath rapidly and than falling to the bottom of the tank and laying there for awhile. I don't think this is normal is the anything i can do for him or is the best just to leave him be