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I don't have a ppm meter due to lack of funds, but if i wait until she has 4 true leaves that are more developed i should be cool to start 1/4 strength nutrients...? I have been using tap water that has been through a Brita Filter and let stand, and ph'ed to 5.8.

Not sure when to start using nutes, any ideas? And i am itching to fire up the 150w hps, i am jut afraid of roasting the little girl. What do you think?