pad

Now that winter-grows are here, (in the northern hemi anyway). Has anyone ever used a heat pad to keep things warmer from the bottom up? Also has anyone used mirrors in the grow environment, tent, etc. ?

Can someone please help me upload pictures? I'm on an I pad.

Hey guys, Would love to get some advice. The leaves are curling down and a bit squashed. Not sure if it's overwatered or something else. Super Lemon Haze Auto CBD by greenhouse. 4 weeks since planting in soil 10-liter pot 50 watt led, 3000k, 25 cm away from plant, 21 hours of lights...

should i use a heating pad to pop my seed???