Def was thrips but sprayed with spinosad but now I have another issue, this is week 3 of flower and it looks like calcium def but looking for reassurance. Added some cal mag during this weeks res swap.
So right now I change each bucket every 7 days, sanitize then re-mix nutrient solutions. . . How often do you change your res? Wondering if it would be safe to do every 14 days or is my current schedule the “safest”