Leaves have yellow tips?

Your yellowing tips may be a copper deficiency, but I doubt that’s the problem, your plant looks pretty healthy I’m leaning more towards heat or light stress, due to your leaf edges up , that will cause yellowing tips and brown spots, I’ll try to raise your light or have more air flow across the top of your canopy.

i think you need to ease up on ferts.. see beginning of burnt tips, plus yellowing at top could be the beginnings of a k-tox Check pH first.. if you haven't paid attention to that, start doing so before making any decisions involving adding something to your soil. i have a leaf symptom chart in week 3 of my ggxww diary. save the image for use. I have a nutrient ppm calculator in week 7 of that diary. it is a google drive link in the weekly comment. both can help you out.