What effects should i expect to see from chronically low humidity? I have a Super cheese (northern lightsXUKcheese) alone in a tent - generally its all looking great ATM and the plant is growing crazy fast ( probably the 900watts of CFL it gets - 18 hours a day) - The growing space is 60x60x90cm TINY! Supercheese is an indica - which grows much like a standard northern lights plant would - a short disease resistant Christmas tree. Temp is normally around 75f at day and about 70f at night. The humidity is regularly falling below 30% during the day - my metre wont register below 20% but it's only done that once when i was allowing the pot to thoroughly dry out. Obviously the pot dries out faster than it would do in more humid environment - does this mean I'm at a higher risk of salt build up and PH fluctuations? I have been flushing every forth day because I assumed I was. My run off PH has been pretty stable at 6. Am i at risk of some kind of fungus? What is the most effective measure of controlling humidity - it needs to be small - with economy/efficiency in mind.