Aquarium temp running at 84

[reef lover33]

I replaced my heater 500W aquatop heater for 120 gallon. Have it set for 80 but even replacement is staying at 84 degrees have 2 WaveMaker by redsea and 3 160s redsea lights. Could it be the lights they are 12 inches from top of the tank. The temp remains at 84 degrees even after lights are off for 10 hours. Any thoughts are appreciated

 

[TX_REEF]

What’s the ambient room temp? With that much water, lighting should t be affecting the temp much if at all unless you’re running halides… can you just turn down the heater??

 

[RedoubtReef]

Does that heater require you to 'acclimate' it before turning it on and have you used a standard mercury thermometer to verify the temp is at 84?

 

[EeyoreIsMySpiritAnimal]

I replaced my heater 500W aquatop heater for 120 gallon. Have it set for 80 but even replacement is staying at 84 degrees have 2 WaveMaker by redsea and 3 160s redsea lights. Could it be the lights they are 12 inches from top of the tank. The temp remains at 84 degrees even after lights are off for 10 hours. Any thoughts are appreciated

I would bet the heater is reading wrong. Is there a way to calibrate it? What temp does the tank drop to if you don't use the heater at all?

 

[EeyoreIsMySpiritAnimal]

Also, 500w is awfully big for a 120. I have a 150 watt on a 140 gallon tank.

 

[C_AWOL]

Depending on the ambient temp/general air flow in the room, it might be working as intended but the rest of the equipment is generating enough heat to elevate the temperature further and keep it there (such as lighting or a return pump)

 

[reef lover33]

What’s the ambient room temp? With that much water, lighting should t be affecting the temp much if at all unless you’re running halides… can you just turn down the heater??

72 to74 room temp. I have the heater set at 75

 

[reef lover33]

What’s the ambient room temp? With that much water, lighting should t be affecting the temp much if at all unless you’re running halides… can you just turn down the heater??

Heater set at

What’s the ambient room temp? With that much water, lighting should t be affecting the temp much if at all unless you’re running halides… can you just turn down the heater??

Heater set at 75 and light are readsead 160s LED

 

[reef lover33]

Does that heater require you to 'acclimate' it before turning it on and have you used a standard mercury thermometer to verify the temp is at 84?

Yes to both

 

[reef lover33]

Also, 500w is awfully big for a 120. I have a 150 watt on a 140 gallon tank.

That's what I thought but it only turned on once after acclimation time for a few min and has since stayed at 83 to 84 degrees

 

[reef lover33]

I would bet the heater is reading wrong. Is there a way to calibrate it? What temp does the tank drop to if you don't use the heater at all?

Turned heater off for 7 hours stayed at 83 degrees. Turned off reef makers today to see if that helps to

 

[reef lover33]

Depending on the ambient temp/general air flow in the room, it might be working as intended but the rest of the equipment is generating enough heat to elevate the temperature further and keep it there (such as lighting or a return pump)

Ok thanks

 

[reef lover33]

Thanks everyone. It seems to now be holding at 80 we placed a fan on the tank. Appreciate everyone and the group!!!!