1mm sand. With the flow we have in our tanks, you will have that sand all over your corals.
Freshwater tanks, maybe, if you have a catchment area to collect the sand. But still think you will end up with sand outside that catchment area eventually.
Thanks for the feedback. Will leave it for the freshwater tanks, still very interesting. Riaan I want to agree with you, not all sand will end up in the catchment area.
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