You can mist them just before the lights go out and no hot spots Do not water every day unless you don't like your plants. Definitely do not fertilize every other day. Thats just stupid.
Start them in seedling soil, give them about 2 weeks and transplant into soil with some food in it. Start with nutes too early and burn the piss out of them . They are babies treat them gently. I don't give my vegging plants any nutes besides the organic guano and worm castings and stuff like...
As long as you repot before they run out of root room you'll be all set. I think you have a handle on it. Just easy on nutes and don't overwater. Good luck.
LEDs work good for veg. I have'nt used them for flower as I have HPS but I hear they work pretty well. I saw a video where commercial growers were using them for the whole process and they looked great. I know for sure the blue LEDs work great for veg and use less power. A lot of people say...
Overwatering for sure and too much nutes. If you just put that stuff on top and water it in every time you water your pushing more nutes down and she can't handle that much.
hid is mh and hps. I think you probably killed the one you have left just don't know it yet. Bet you won't leave those sprayers on so long next time. Live and learn. At least your trying. Good luck.