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My ph of my tap water is around 9 and when i add 1 drop of my ph down it takes it down to around 5.9 i read your not supposed to mix ph up and down together so how am i supposed to get my ph at 6.5 :/

I have six seedlings with two desk fans and I'm wondering if they will get burned under 4 40 watt cfls & 6 23 watt cfls it's about 3.5 inch's from them and will this be enough light for out the rest of my grow it's a total of 19,400 lumens.