Sorry for the multiple post, I didnt want to edit because this is probably pretty important... You want to watch out for SILICA , my boyfriend informed me thats what I was told to watch out for, and most play sand contains this. here's the definition for SILICA
Silica- A white or colorless crystalline compound, SiO2, occurring abundantly as quartz, sand, flint, agate, and many other minerals and used to manufacture a wide variety of materials, especially glass and concrete.
It gets into the fishes gills, and burns them.
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