Hard to say. Maybe a more experienced member can answer this (I am newby but I did my homework well that's all
). Get a thread open. That way, you should be able to get your answer.
About the pH, I think mine is even low (prolly close to 7.9 or something) so I have ordered a digital meter for $10 from ebay and should be getting it soon. Better to get accurate reading for pH since the decimal values matter :P