In day 6 of cycling and have nitrate and nitrites at 0 and ammonia on the rise now at 1.0 with a ph of 7.2. My question is two things, 1. How often should I change water in general - I hear once a week 10% twice a month 20% and monthly 20%? 2. During cycle, do I change water and if so, how often and do I clean gravel and replace filter? Thanks for the advise and I love this sight!