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ph level unstable

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    1st Time Grower/ PH Problems - Please Help!

    this is my set up high output Fluorescent lighting Hydroponics Bubbler system. rockwool medium General Hydroponics nutrients 2 Clones (Grape Romulan and Hawaii 5-O) I've only had them 2 days. But they seem to be a few weeks old. My main problem is I CANNOT keep the Ph balanced and I...