I used to be really into aquariums, and used submersible heaters for my big tank ( 125 gallon)...If it were sterilized and sealed( the lid so air cannot get in) , could an aquarium heater be used to keep the temp constant on the primary?
Don't see why not.
Most have issues keeping temps below ambient with reasonable control. You fermeting outside?
you are better to use a water bath and use the heater in the water bath rather than directly in the fermenter. That will minimize the risk of contamination, allow you to more easily adjust the heater after it's first installed and the added mass of the water bath will make for a more stable temperature.
I would recommend running closer to 65 or 68 for most ale yeast. 80 is much too high for most in my opinion.
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