I'm worried about some brown spots and dying tips. It seems that the soil is a little overfertilized but not sure if this is the only issue or maybe the plants are getting stressed again because of too much light. Just in case, I decreased the light hours by 2. What do you think?
Bio-Bizz strikes again
Your light is fine, no signs of bleaching or burning.
The spots are calcium from either a lockout OR PH issues.
The faded leaves at the bottom of the plant appear to be nitrogen def that may or may not still be present.
I ran Bio-Bizz as 5ml/gal grow and 10-15ml/gal bloom with occasional adds for deficiencies, yeah bio-bizz its a trip
Decrease the amount of bio-grow you are using a little bit.
Increase the amount of bio-bloom you are using a little bit.
As you have already guessed, it is probably due to the soil.
Best of luck, and happy growing! :)