USING BIO PELLETS

[Reefpins10]

I am thinking of using bio pellets to avoid doing water change. Has anyone here had any success with those bio pellets without changing water at all with no algaes growing in your tank ? I would like to hear your advice. I had someone tell me that he didn't do any water change for over 6 months and he will continue to do that, but I also had someone from 3 different LFS tell me I still need to do the water change at least once a month. Its really confusing me ! I know those pellets are for removing nitrate and phosphate, but why is it necessary to do the water changing if we use them ??? I never check my nitrate or phosphate level, I just do 20% water change every 2 weeks, but my tank still gets quite a lot of brown and green hair algae, other than that my sps corals are doing great with color.