I am using a 1500watt full spectrum light with 18hrs of light, I am growing in pro mix, which has a high PH level from the start around 7. I cant seem to get the PH to come down at all. I keep my tent about 70-75 degrees, and the humidity around 50. I use all natural FOX FARM fertilizers. And I am following your website, and having great luck. there are just a few issues I cant seem to get adjusted. 1. I cant get the PH where it should be. 2. I cant get the humidity any higher. my hydrometer says 30%-50% daily. I have a large amount of moister in the tent. ( running down the walls about 3/4 the way up the tent). I have not started my auto seeds yet as I was trying to get my setup regulated better before starting them.