So I'm in the middle of setting up and moving my fish to a new tank. I've had them in a bucket with a heater and a wave pump aimed at the surface for aeration. They were in there about 18 hours, perfectly fine. We left the house of a bit and right before I had turned on the heater in the new tank to get it ready for the fish. Well I inadvertently hit the power strip powering everything for the bucket. It's about 63F in the house, 20F outside. I'm not sure if it was the temperature of lack of aeration but I lost a Banggai cardinal and my tang was laying flat on the bottom on it's side. I noticed it was still breathing so I dumped some of the now heated water from the tank into the bucket. After about 2 min the tang was back up and swimming. So I made sure the heater was on and left them be. I checked on them 10 min later and the tang was back on it's side at the bottom. Several other smaller fish were in there seemed fine, so I'm assuming it was more of an oxygen thing. I put the tang in a bag and floated it in the new tank for a bit and then released it into the new tank. The salinity and the rest of the parameters were the same due to all the water just being mixed. It's currently at the bottom of the tank all fins moving, breathing quickly, upright and laying against the glass. I have a wave pump at the surface pointing down to aerate the water. Is there anything I can do for it? I have the lights off and I'm just letting it be for the moment. It's been about an hour since I put it in the tank and he's not getting any worse but doesn't seem to have any initiative to swim.