Sick plants

My plants have yellow spots, the leafs kinda drop down at the end and like 3 out of 8 of them have purple stems


Also its very unnoticeable but they just curl a tiny bit on the side of the leafs

The chocolope at one point its leaves where going white but I think I have fixed that problem

PH meter is ****** and have another water one but it does not have any calibration fluid I might adjust tap water to around 7.1 for the mean time

Anyone got any idea on my problem?

Also my light is a MH which is about 20" away from the plants
 

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