Do not let the room temperature get over 35 C (95 F) as this hurts growth. Optimal temperature is 27-30 C (80-86 F) if you have strong light with no CO2 enrichment. Less than 21 C (70 F) is too cold for good growth. Low temperatures at night are OK down to about 60 degrees outdoors, then start to effect the growth in a big way.
Flickr: Wolf Rock. For god's sake, this is simple. A pizza is cooked in a pizza oven, not a pizza skillet. So to reheat pizza, you attempt to replicate a pizza oven. Place a baking sheet in your oven, blasting the heat as high as your oven will go. Once the baking sheet is hot, place the pizza on it. The bottom will be crispified by the hot baking sheet.
So after years of trial and error, I think I've discovered the right way to reheat cold pizza. My main issue has always been with the crust: after reheating in the oven, microwave, toaster oven, etc, it's always been limp and saggy (ok for rolling up into a pizzarito, but not much else). So my solution to that? Put a baking sheet into a cold oven. Turn it up to 400, let it come up to temperature. Put pizza on pan, let it go for about 10 minutes. Take the pan out of the oven, let it sit for a couple minutes.