Basic grow

Hi all, Coming to the end of week three and there's been a few things happening. She's almost doubled in hight but is still very bushy with not a lot of space between nodes. Quite early on I decided I didn't like the hoops I'd put in for training so I took them out again, gave it a couple of days and did some light defoliation instead. She seems to have taken it well. On advice I was misting with an Epsom Salts solution. At day 19 I had a slight panic when I noticed white stuff on the leaves! Turned out to be too much salt..what a nob 🤨 Midweek I found my runoff reading at a pH of around 8. I gave her a heavy water with just a little CalMag then held off. She wasn't showing any obvious pH issues so today I gave her a feed with 1ml of grow and .25 of CalMag. It's hard to see in the pics but some of the new growth is showing a burning effect on the tips of the leaves. It could be light burn but that seems unlikely. My Lux was reading at 35k but I raised the light a bit just in case so now it's reading 32k. More likely its a nutrition problem because like I've said this is my first auto and I don't know what they need. Thinking I'm going to miss the next two feed days and just give her some heavy watering. In theory the next week should be taking her into flower. I'll be deciding if I want to do some LST or stick to defoliation and tucking. That's about it... Same bat time, same bat channel next week!