Brown spot and crispy ends

Hi there LeafJe, you have PK related issues, this you can see from the yellowing discoloration on some leafs and the more colorful discoloration on other leafs. Basically the BAC Bloom is NPK 6-5-6 , but in flowering you need something like 3-6-6 or 4-8-8 , it's a question of ratios, the burnt tips is from too much N. so basically you need to fix your NPK ratio with PK booster, or a more appropriate bloom nute formula. I hope this helps ! 🚀

Hello LEAFJE good idea but you can increase calmag until 1ml/l then try to have a ph of 6 . if you want to have a quicker effect you can spray your calmag on your plant. Good luck bye

Looks like a calcium deficiency. LED lights will make a plant use more. Add calmag.