Sounds like a very touchy subject for some. "water changes are very important" would suffice and a link explaining why. It might seem like an arrogant question but some of these replies are even worse. People don't ask unless they really don't know or unsure. From experience, the only way i know to cut down on water changes is having more filters and canisters at best. But then again, you would have to clean all your filters on regular basis. Look for DIY filters like sumps and such. I'm trying to make sumps for all my tanks.
Well, good luck on your tank.

"Only geniuses ask questions"