i have a 250w Ebo-Jager on my 125 system seems to be doing a fine job. when selecting a heater remember that your lighting/pumps will be adding a fair amount of heat also.
Ebo's have had issues with shorting out and stuff. look at 2 X 200 watt heaters. I use gen-x titanium and crystal heaters, they keep the temperature really well.
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