I am not doing water changes as there are no problems with the water. However, this means no siphoning of the substrate. I have nassarius snails. What does triton recommend? Use snails, gobies or conch to keep substrate healthy?
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I've found that a good mix of Tongan nassarius and conchs keep my sand beds pretty clean. I'm not a huge fan of the mess gobies sometimes make.
Once a week I siphon my substrate straight into my sump with a filter sock at the end. I think it works pretty well.