Hi GC! I have no clue how old are they because growth has been stunted before, but they have some yellow spots, mainly older leaves, some bottom leaves have that crispyness to them and turning some what brown from tips on, thats good indication to start giving nutes on next feeding. They are in canna terra professional soil with alot of perlite, so far given only tap water, without all that ph and chemical bullshit. They are under 4 tube 216w T5
Pictures were taken before watering like hour ago, they are in 5gallon fabric pots They are auto blue pyramid by gorilla seeds
I would get some epsom salt for a cal/mag supplement. It could have something to do with your spots on the leaves. A little spotting, browning, and drying in the bottom foliage as the plant gets bigger is pretty normal and not a huge concern. Your plant does look healthy but building up a healthy amount of cal/mag in the plant is important for big buds and healthy growth.