sup to the people in here, im planning a african cichlid pond and im wondering whats the most effective way to heat a pond to 80F for 5000 gallons in winter, im planning solar water panels for spring and summer and an electric 11,000 watt heater in winter. this is going to be in a small greenhouse (taking half the space) i need a better idea thats cheap in operating costs. also, a good kind of filtration for this thats cheap but effective