wow 86 degrees so I assume 80-82 degrees is safe for my cory's I know my heater will work around 80+ degrees I'm just scared they will get close to it and burn themselves its a glass heater. Ill get a thermometer tomorrow most likely I rather not take the chance of using my house one I'm very cautious when it comes to the fish
:(. because sometimes my betta goes through the opening between the heater and the tank glass when i touch the heater when its on 80 degrees it kinda feels to hot for my skin,and the cories like to go up and down the heater aswell