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When you do water changes siphon it out.rinse your food with ro if you feed frozen and don't over feed . Do you have a skimmer? Do at least biweekly wc, weekly if you can that will help get rid of it.
Nassarius snails or sand sifting starfish. The sand sifter won't live long, but the snails will. They burrow through the sand and keep it circulated so no chemicals will build up under the top layer.
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Bribo12 +1. No need to syphon your sand bed. By all means clean the top of any unsightly bits but if your bed is relatively deep it could tip your parameters over the edge.