I used to lmore water changes then I do now due to the fact that the reward wasn't worth the risk. I do supplement with seachem, used to be a kent man but after being at this site awhile thought I would try seachem and save the pennies difference. One of the things a lot of people don't consider is if it isn't broke don't fix it. If you have cycled the tank, aren't over feeding (we all overstock) and the tests come out right why run the chance of adding a problem? I use ro water, keep the salt clean and dry, use an isolated bucket (only for the tanks!) but still don't like to do more then monthly water changes. Unless there is a problem then a 20% water change is the first attempt to cure the tanks ills. I should also note that if I miss a water change its not a big deal and I wait till the next time and stay on schedule. I was running a 125 with no water changes for 1 year just top off water and the thing ran great no deaths, exceess algae, and great growth it was an experiment and I didn't see a difference and thats where my theory on water changes comes from. Thanks for listening.