if you do not use them at all, your params will be the same so its ok to remove them or add more etc
display reef tanks never run low on surface area, I know the cer media is sometimes claimed to reduce nitrate but when I used some, it didnt. no change in stasis one way or another other than being a new zone of waste retention that will need cleaning occasionally, is no harm to use that's for sure.
complete removal and running an empty chamber is also ok, harms nothing
if polled nearly all reefers would respond that the system is adapted to the bacteria in these zones and must be weaned off slowly, but that isn't the case in the sand rinse thread
we could pull your whole sandbed out, pull the ceramic media, add three new fish and the system would still run just the same. thats been logged on seneye.
the rationale for this mechanism is that surrounding bacteria loading and surface area manages itself and live rock manages itself. whatever the least amount of surface area it takes to run a reef runs independent from the orders extra we add. you can reduce back to the least amount and its still the least amount to run a system.
any use of live rock at all will run more bioload than you run right now, alone and without any support.
thats not stated to cause procedural anarchy
its so we can move tanks, upgrade, downgrade, move to a trade show, change our own reef, remove the sand, add to the sand, change the rocks and never lose a single reef. the reason to be precise on filtration allowance is because it runs all that $