Help, need diagnosis via pictures attached.

[Bloomin Idiot]

PH is 6.0-6.5

Soil or the water ph? I think I see a pot of soil back there 3 gallons?

I would say water with 450ml daily and no needed to flush- you can prolly up the rate from the label. soil watering would like a ph of 6-6.3. also are you adding cal mag to your 3 part? I cant tell but leaves kinda look like the need it. hard to say in the hps lights.