i do have a question concerning sand. 5 or 6 years ago i bought some "sand" which in fact was very fine Silica. When i say fine, i mean really really fine! What was nice was the crater, waves and other aquashape it was doing: was looking like the surface of the moon. Then my concern has been that it was so fine that it could easily go through the fish's gills and eventually damage them (i.e. abrasif like sand paper). Thus after 4 days i took it away.
What do you think ?
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