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Re: heater choice
I have one of these on every tank, very reliable. You can run up to about 1200 watts of heaters on each controller.
https://www.amazon.com/KETOTEK-STC-1...stc+1000&psc=1
Mine are Celsius only, but you can get them with Fahrenheit...
https://www.amazon.com/Inkbird-Tempe...oller+itc+1000
Wiring is required, but its not hard.
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Re: heater choice
I made my own controller using the STC-1000 as the main unit
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Re: heater choice
I used to have 2 300 what eheims, but didn't like the way they looked in the tank so I recently made the move to 2 Fluval E series on my 125 gallon tank. They blend in well with my black background and they get the job done. I have them connected to an inkbird controller as well.