Yellowing of internal leaves.

I have 7 plants in an insulated 8x8 full mylar room with a 1000w hps and two 300w t5 flo, good air flow and the air is replaced every five min, growing soil with the full Roots Organics masters program. Im having leaf yellowing and drop but only on the internal leaves, what could this be caused by?

did u ever figure this out? cuz thats happend to my big plant (first plant) and i thought it was because of not enough light, but im not sure anymore because i spread the 4 tops to let light into the middle and it worked for awhile then its bin doing it again, mayb when its low on water? cuz ive stretched out days of watering a couple times, shes not perfect but i want it to b when i start flowering

Not yet I have posted this same question on a few othe fourms, I will let you know. This dosent seem to affect the plant wut im woried the leaf litter could mould

It's normal to have lower leaves that get no or little light to yellow and die.

If it's the older, lower leaves and there aren't TOO many of them, then no problems.

I remove these leaves carefully if I'm concerned about mold. If they are blocking light to greener growth, I always remove them.

View attachment 1076743The rest of the plant looks great not to concernd.View attachment 1076742

week 3 in flower