Got ASF's, questions about heat/food.

[Sasha2]

I just bought 2.4 ASF rats, still quite young. They came out of a nice warm rack to my cold basement in a 55 gallon tank.
I did put a CHE over the tank and insulated most of it for now. Do they need heat to breed if the room is around 50?
I bought some rat block and mixed it with dog food. But Ive read a few different things about diet. One says dog food, another says they prefer grains and low protein so not sure what the ideal diet is. Any ideas?
They did love the mixed fresh greens I put in, they ate all of it.

Anyway I got a couple hides, and some branches to chew on in there as well. I will probably split up the group in a bit although again Ive read that family groups dont fight if they have enough room, so am considering leaving them all together.