Quote:
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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Perhaps you're getting silica and silicates confused with H2S, which is hydrogen sulfide. That's pretty nasty to fish. The worst thing I know about silica and silicates is that it encourages the growth of brown algae. This doesn't look great, but is not a danger to your fish!