To be honest with you, I only change water about once every 8 months in my crushed coral tank. I've gone a year before without any problems. I run ozone, a UV sterilizer, and carbon, have lots of live rock and a refugium loaded with chaetomorpha, mangroves and shaving brush plants. I also have a wet dry with ceramic stone.
I monitor calcium, strontium, iodide, pH, alk, residual ozone, phosphate, ammonia, nitrite and nitrate. I only use RO/DI water and have lots of snails, crabs, urchins and worms to clean the tank for me. I get a very light dusting of algae on the front glass that needs to be cleaned off maybe once a week but other than that, the tank stays clean. I never clean the back glass because it gives the snails something to munch on. I don't get any buildup on the crushed coral nor do I need to vacuum it except when I do the water change.
Ammonia, nitrite and nitrate are all 0ppm. I had a problem with phosphate but it has gone away since I quit feeding flake food and switched to homemade food. My point is, water changes have their use but they can also be very stressful for the fish. If you keep your tank in balance and monitor your nutrient levels, you can avoid the need for frequent water changes. The only time I ever have any type of algae outbreak is after doing a water change. I may get a small diatom outbreak which goes away in a couple of days... similar to new tank syndrome.
I recently added some lime green zoanthid coral and and anemone for my clowns and both are doing very well. The anemone has opened up and is eating regularly and has darkened quite a bit since I got it. The zoas stay open and have improved their color as well. My mandarin goby never seems to run out of live pods to eat. I never have to feed him, he finds the food himself.
I may be in the minority but I view having to do water changes as a bad thing. IMO it stresses the fish and forces them to acclimate to constantly changing water conditions. As I add more coral I may have to adapt but after having this tank for 7 years now, it's done fine with only very minimal water changes.
