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any ideas thanks

the yellow spots

just thought i would post a few pics, i started with an hps bulb, but just bought an mh bulb. this is 3 weeks in a deep water setup. i am using liquid karma and pro grow. only problem is small yellow spots on the leaves. ph is good, 6.0, light is like 2 feet above the plants, so its not burns...

is it ok to use a 400watt hps and a cfl for growing. i put the cfl on there for the blue lighting.