My temp 80.

Reef tank, fish-only?
What kind of corals (if any)
How many gallons of water volume and how many watts is your heater.
Do you have a temperature controller?
What do you have your temperature set to maintain?

80d isn't going to kill anything. The question is why is your temp falling below set point (if it is) and why is it going up a full 2 degrees before the cooling kicks in.
 
I keep my tank between 77 and 78. Fish and my coral have no problem with it. Why is yours deviating so much though?
 
Reef tank, fish-only?
What kind of corals (if any)
How many gallons of water volume and how many watts is your heater.
Do you have a temperature controller?
What do you have your temperature set to maintain?

80d isn't going to kill anything. The question is why is your temp falling below set point (if it is) and why is it going up a full 2 degrees before the cooling kicks in.

I added a algee reactor with led lights to my sump. I think the heat off the lights is causing it. Imovedit father away from the tank last night. That seemed to help. My heater is a 300 watt. I unpluged it to make sure it was not doing it.
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

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  • No.

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  • Other (please explain).

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