Mud
Hello,
Just my very own personal opinion here.
I believe a good skimmer is necessary but that's just all that a tank would ever need. The live rock and sand bed is providing all the bio filtration necessary.
Recently my skimmer pump died and I've been running skimmerless for like (I don't know) a month now? Other than the water getting smellier and I went to use some carbon, the bio filtration provided by the rocks and sand bed was good enough to keep the system going.
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