It very well could keep the temp down. That temp isn't terrible but it's flirting on the high side. What I do and suggest you do is set your heater at pretty close to whatever your determine your high daily temp is and this way during a normal day your heater will keep it up close to it's max when everything is running and heating the tank thus decreases your temp swings. Personally I like to keep my temps in the upper 70's that way I have more wiggle room but without a chiller you have to work with what you have. I do know that you can get some of those VERY nice controllers that will control your heater and chiller totally automating your system for you. In fact, I am seriously looking at getting one of these
**Neptune AquaController** for My tank.
Good luck and keep us posted.
Allen
