Last night, instead of just flipping the tank light off, someone turned off the entire power strip to the betta tank. So of course that means his heater wasn’t running for about 12 hours. The water temp dropped from 81 to 74. I would normally do a water change today anyway. My question is do I add water that is 81 degrees like I normally would or should I wait for the heater to bring the temp back up and add water that’s 74 degrees? He seems ok but I know a temp swing like that can put them into shock.