Hi,
Actually, all fine dust is not healthy...be it silica or any material. So, I would try to reduce your exposure to the dust.
Silica sand (including sandblasting sand) has been used for years and most reefers have not had problems. As you know with this hobby, you get what you pay for. If you plan to use any sand other than Caribsea, do a search on RC and you'll get more info for what to look out for.
- Victor.
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