Calcium deficiency??? Magnesium???

Calcium deficiency, Calcium deficiencies tend to appear on newer or growing leaves, which means calcium deficiencies first appear on leaves where there’s rapid vegetative growth.

Кальций конечно

Leaf chart - Week 3 of my diary.. 'save image as' https://media.growdiaries.com/static/post/photo/43724/2272621_gorrila-glue-4-white-widow-durban-poison-grow-journal-by-nobody01expert-seedsgorrila-glue-4-white-widow.jpg calcium can be yellow/brown spots. Less likely magnesium, because i don't see interveinal chlorosis. Maybe on Ca, but check your pH... raise it slightly and that might help with chemistry involving Ca in the plant. Check this first before adding things. If it wasn't used to the sun, and you start putting it under the sun, it'll demand more from the plant than under your grow lights. you need to likely feed it more overall,if you continue to do this as the plant receives more energy. Light and CO2 are what dictate how much to feed over time. Add more, and the plant requires more. A deficiency is more likely, but some toxicities can cause spots like that... but, usually have accompanying symptoms (see p/k on chart). Plus, you gave a flush and exposed to more light... leaning toward a def of some sort. a ph change might fix this, or you may need to change ratio of what you feed or concentrations etc... you likely add a lot of Ca beftwen ferts and tap water, so make sure to check those labels... it is an easy way to eliminate possibilities. use a nutrient calculator online.. i have a spreadhseet that works for dry nutes for sure, but bit less certain on the liquid portion of it,lol.. wellcome to try it..: https://drive.google.com/file/d/16zcbVQJT15MhsNgbw-Hw7CHRmgu1t0_M/view?usp=sharing

Did it happen before or after took it outside? Looking at those stones can see your roots heating up fast. Normally cal deficiency is white lines not rust. Think rust is result of iron, boron def or clorine over dose. Your multi color (2nd pic) is a pH Flux. Were low then went high. Just add tsp spoon of lemon juice to gal/water. Will fix the multi coloring.