<a href=showthread.php?s=&postid=8222321#post8222321 target=_blank>Originally posted</a> by jay24k
I wouldn't worry about doing so many water changes. IMO too many cause issues with stability. Let your Calcium drop down naturally when it is high and dose your alk up with baking soda like mentioned. Baking soda can drop your ph temporarily but unless you dose a ton, it's not too bad.
I do water changes once a month or even once every 2 months if I'm busy. All you need to dose imo is calcium and alk. Check magnesium every 3 weeks and dose that if needed as well.
If you have a good export, then you should be fine between water changes. However, I'd recommend once every 2 weeks of at least 10 percent or once a month of 20%.
Having a good honkin skimmer and some macro algae makes the world of difference.