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Weedhound Reviewed by Weedhound on . DWC still having trouble's. Need Help ASAP Ok. I am using a dwc system with two flourescent dual spectrum 65 lights. It has a 6 gallon resevoir. I am using tap water with a ph of 7.5. Also i am at 12/12 lighting right now. I am also using an organic micro and bloom. Last week i had a problem trying to get control of allgae. I flushed my whole system, water lines, air pump and the air disk yesterday. Now today when i went to go check on them this is how they looked. The ph is 5.65, water temp at 68 degrees and the air temp about 74. Rating: 5