Heater Size

[mike31154]

Two smaller is recommended over a single large. That way you have a backup in case one stops working or gets stuck on. A large heater stuck in the ON position can cook your livestock. Many folks also use a temperature controller and/or aquarium controller to automate heater control and minimize problems.

I'd say two 150s or two 200s should do it for you, depending on where you're room temperature is at most of the time.