I woke up this morning and notice that one of my snails was flipped on his back no big deal. When I went to flip him over I noticed my water was much cooler than normal. I check the thermometer and the tank had dropped about 12° to 66° overnight. I figured the heater must have gone out so I replaced it with my back up and slowly heated the water back up to 78°. My clown fish has been acting funny since staying in the corner of the tank on the sand bed. I’ll attach a video. Has anyone had this happen to you? Is there anything I can do? All my other fish seem to be normal.