First off, ridiculing reefers are not allowed in RS
Second, every aquarium is different. Yes, I do weekly water changes...but then again I feed a LOT and often. If I didn't my tank would look like a sewage run off pool... yuck!
Biweekly, bimonthly, semiannual water changes?? ... As long as the param stay in healthy ranges for the tank inhabitants... go for it!! There is more than one way to keep a reef going successfully~~