I acctually keep the PH of my plants at a constant 6.2 run off water.
And yes My tent is lined with a white plastic vinyl. Funny thing is is that the new modles of sun huts come with a reflective metallic interior and are advertised as "non-toxic" yet sunlight supply never made a recall or said anything formally telling customers that the original may be toxic like hydrohut did. So Im taking the skin off and hanging reflective partitions and some how figure out how im goig to extract the heat out of the room. If this doesnt work Im shutting down the 1000 watt and growing in my closet with the 400.