First time grower here. Growing with coco, 5x5 tent. 12x4ft bridgelux strips Started off with problems as I didn't make the drainage holes properly. Eventually I changed them to bigger pots and gave them a feeding. They loved it and thrived and all was right in the world. After a week or so I gave them their second watering that wasn't just PhD water. My local hydro store guy said for the next watering to give them cal mag. Everything since then has been chaos. After watering with them with cal mag they completely stopped growing, and the back left one started getting some kind of disease or something happening to it then I started doing stupid things in a panic like feeding them again and then flushed the messed up one etc. Now the other 3 have started having black dots appear on the leaves Last time I watered these I watered all 4 with calmag. I would love to hear what you all have to say about the pictures I'm posting such as: what the really messed up one had going on with it, what the black spots are on the others, if I should just be feeding them everytime or doing a watering of calmag in between Any sources for things that i should read or watch to level up my knowledge on growing marijuana in general. I know this crop is probably not going to end well but I would like to learn as much as I can with this batch before starting on a next batch Thank you very very much in advance for your help.