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mcgyvr · 03/08/2018, 05:40 AM

2 x 100W should be ok for a 40G tank assuming that your ambient room temperature is no more than like 8 degrees cooler than the temperature you want to keep the tank at..
2 x 125W (or 150)would be better if you keep your room temp around 68-70..

And yes you set them at the same temp and I would recommend a controller like an inkbird blue.. Heaters are known to fail.. Having them run on a controller is a good way to help ensure that when the heater temperature controls fail it doesn't overheat your tank.

Inkbird blue is like $30 and you can plug 2 heaters right into it..
https://www.amazon.com/Inkbird-Tempe...aquarium&psc=1

03/08/2018, 05:40 AM	#3
mcgyvr Registered Member Join Date: Sep 2003 Location: North Carolina Posts: 20,050	2 x 100W should be ok for a 40G tank assuming that your ambient room temperature is no more than like 8 degrees cooler than the temperature you want to keep the tank at.. 2 x 125W (or 150)would be better if you keep your room temp around 68-70.. And yes you set them at the same temp and I would recommend a controller like an inkbird blue.. Heaters are known to fail.. Having them run on a controller is a good way to help ensure that when the heater temperature controls fail it doesn't overheat your tank. Inkbird blue is like $30 and you can plug 2 heaters right into it.. https://www.amazon.com/Inkbird-Tempe...aquarium&psc=1 __________________ Who me?