Thanks for inputs Jimifrog and 7urb0! If I find a stand for 40 breeder within a couple months will set that up; if not it's a well insulated 75. Been thinking FW aquariums are cheaper to maintain (electrical energy wise) than a terrarium for ABF. My 75 had a 14 watt filter (AquaClear 150); 250 watt heater (runs on thermostat); and 48 watt lights (run for couple hours a day). Just heating it in terrarium mode might match that!