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    Humidity and control

    so is humidity REALLy that important during the veg stage? Whats the best way to keep the humidity up? Buy a humidifer...? i would guess that they also make a humidity meter (other than an outdoor barometer), is there anything specific i should be looking for?
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    Sub Carbonated water for CO2?

    I had a friend who was telling me that instead of using CO2 gas you could spray it with seltzer water and the carbon from that would be absorbed through the leaves. Is this true? It seems that the fine nozzel on the sprayer would burst the carbonation bubbles. Any help?
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    When to switch light types

    How do I know when exactly to switch from florescents to HPS?
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