i just started my new 10G and the ph readings were always 6.0? Does any1 know what causes this? I changed 70% of water for 3 days already ph still drops down to 6.0 and yes i tested my tap water its fine... i even cleaned out the whole 10G for a new start, but the problem was still not resolved. i even used a ph buffer and after a few hours it went back down to 6.0?