Hey GD, I have noticed some brown spots developin...

Hello! It is really hard to tell at that early stage , 1st it makes me think of a Magnesium deficiency due to the purple stems of your leaves but when I take a look at your day and night temps there is a 11°C gap that can explain it and your cal mag amount is correct. When I take a look at the edge of the leaves and the tips they appear burnt and some leaves have little dots which makes me think of a Phosphorous deficiency at a early stage because the petioles ( stem of the leaves) are turning purple and the dark/blueish green is also a sign. What you need to do is to decrease the Bio grow amount and increase the Bio bloom to make the balance. I hope it will help you ✌️🏼😁