So this may be a total noob question, but so be it, I want to do this right with my first saltwater tank.
I currently have my heater in the tank, because the one I bought was like 1" too long to go in my return pump chamber on my AIO 24g. So I just got a Cobalt heater that will fit in that chamber.
Is there any trick to adding a new heater and removing the old one, so that I don't mess with the water temp too drastically? Do I just set the new one to my current temp of 79, plop it in and let it run for a bit and then pull the other one out? Having 2 in at a time won't hurt it right...they should turn off when they are at the target temp, right?
Thanks!!