Need advice from experienced grower

Please look at my green-o-matic and advise me on what is going on.

Planted in miracle grow moisture control potting soil. Under T5 badboy 4' 8bulb. Light is kept just about tops. On 18/6 schedule. I also have 4 photoperiod plants that are a couple of weeks older that are not yellowing at all. The only difference is that they are in bigger pots.

Bump ( hoping someone might see this that can help me )

spray on 1 tsp epsom salts to one gallon water it will hellp alot . ions are starting to lock out namely cal. mg.sul.

Ok, I just mixed some up and sprayed them down good. Thanks!