First Grow - Purple Bud Auto

It looks like a minor calcium deficiency. A bit of Cal-Mag will sort it. Biobizz do their own one if you want to keep using their brand.

I already answered you about Cal Mag and keep giving it, and you'll see improvements... my mistake was not looking at the fertilization. You're giving 0.8/1ml per liter of water of Biogrow and Biobloom, basically you're not giving it almost anything. The plant behaves like this when it goes into protection mode; it reallocates mobile elements where it needs them most, so it takes nitrogen or other nutrients from the leaves, which turn yellow and then fall off. Out of 10 responses I give, at least 3 are because people drastically reduce the amount of Biobizz fertilizers, and yellow leaves appear... Biobizz has good but light fertilizers; about 4ml of Grow and 4ml/l of Bloom would be the right dose for a plant of that size. Remember the Cal Mag, you've already saved it with that... in fact, I don't see any more brown spots... except for the old ones.