Debating between a new heater or a micro temp controller

[Nelson90g]

Deep blue cube 8 gallons 86gph biomax hang on hydor powerhead 100 50 watt dont know brand heater i think marineland and clip on led lights heats tank half a degree tested . Having trouble keeping my temp table enougj for breeding day time its 80-81 night 76-77
My house is at 69-70 at night and 75 during the day dont know if to waste my money on a cobolt neoterm or get a azoo micro temp controller