How often do you guys find you need to adjust pH? I have had my system going for almost 3 weeks now....3 gallon DWC with maxibloom and hydroton. First nutrient bath was with tap water, and the second was with RO water. I have some universal pH test paper and have seen variations from about 5.5-6.5, but in general, the pH is pretty stable. How closely regulated do you try to keep it?