I have my phals in coconut husk chips mixed with a little charcoal and it has worked well for me. During the summer growing season I use fertilizer at 1/2 the recommended strength but I don't water the plant with it. I just mist the fertilizer onto the leaves, the exposed roots and the top of the medium so the plant really isn't getting very much. If I was going to water the plant with it, I would use less, probably 1/4 the recommended dosage. I'm sorry I don't figure ppm on my fertilizer. Good luck.
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