What kind of nutrient is missing?

Okay. So wit no info on NPK. And looking at your diary with its limited details here is the 2 options that I can give. You can match your issue if you find 1 of these options could be the issue So if you're using a tonic & its been working well up to this point..as in week 3. The plant looks healthy & whole. So I don't think its a lack of anything persay. So here's my take 1: Your plants leaves show a whole host of issues. And using such a powerful light like the SE5000 and your plants size you possibly let the soil dry up too much and these are the leafs that your plant used as feed. As that's what a plant does that's on the edge of having no liquid to intake. It takes certain nutes from the closest source and not been able to take from the soil as was too dry it slowly took these from the next nearest source? 2 As I said there is soo many issues i see in these leafs the only other possibly thing I can think off is the PH been off. These are really the only 2 things that could shoe such a host of issues In a plant.. If its No1. When feeding your dry soil. Give it a small feed of water. Then come back to it and top it up properly as too quickly it'll be bad for the plant. Especially if it's a nute feed it'll OD. If its NO2. PH feeds if they are water or nutrient feeds try and have them in the same ph window. 6.7 been soils optimal window. I hope this helps