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HELP...NOT SURE WHAT TO DO NEXT.....beginner on hydro plants are two weeks old, lighting is at 18 hours 400w ph meter reads 6.8 to 7.0 ( paper tester) i have a ph digetal coming using 20-20-20---- 25 mil for each 4 gallOns IS THIS RIGHT? pump is the 3500 model fish pump, , i have it running all...