Wow! Two quick responses. Thanks.
Pete and Kevin, that's what I wanted to hear. I knew the two 300's were overkill, but originally wasn't sure if two 150's would be enough. I got a pretty good indication when I saw that one 300 was maintaining temperature. And Kevin, I run my heaters through a controller, so no need to calibrate the heaters. I actually turn them up past 78 and let the controller turn them on and off.
Pete and Kevin, that's what I wanted to hear. I knew the two 300's were overkill, but originally wasn't sure if two 150's would be enough. I got a pretty good indication when I saw that one 300 was maintaining temperature. And Kevin, I run my heaters through a controller, so no need to calibrate the heaters. I actually turn them up past 78 and let the controller turn them on and off.