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    Exactly when do I swtich from 18/6 to 12/12?

    I have a few indoor plants that I started from seeds. They are just over 2 months old now and they are starting to develop their sex organs. This is the first time I'm growing these plants, and I'm unsure when the "BEST" time is to switch from Metal Halide 18/6 cycle to High pressure sodium...
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    Newbie here: Seedlings have tall and thin stem

    This is my first time trying this, so I'm a total newbie and your help is much appreciated. I started seeds 3 weeks ago and my seedlings look very tall (~ 5 inches) and the main stem looks very thin. I even had to use wood sticks to support the plants. The plants have been under 400W MH light...
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