Even though I just started a tank again I had numerous sucessful salt tanks over course of 5 or 6 years. I'm by no means saying I'm a professional but I do know that by leaving stuff alone and allowing time for natural progression I had excellent sucess in every one of my tanks. I will stand by what i say. I can assure you large water changes can deprive your system. I'm not sure of the science behind it, maybe someone who knows can chime in here. If you change out 100% your water you can cycle a tank that has been running for years... The water and what's in the water is very important too. It's a madder of opinion but I always had great success with smaller water changes and leaving things alone. Again this is my opinion...