I have about 200g total water volume, maybe 100 pounds rock. I also run zeo part time. Meaning I forget to do anything with it for months at a time, which translates to "you can quit anytime you like".
I have never had measurable NO3 in 4 years. I attribute that to quality rock that I keep clean with lots of flow. I also have near 0 coralline on the rock, which IMO plugs up the pores reaching the anaerobic bacteria.
I change about 25% water volume bi-weekly and have never vacuumed my sand bed. Seems easy enough to me
