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Re: sand as a substrate

I am not sure why sand has been suggested as a substrate in a
fresh-water fish tank. However, for a planted tank it is common to see
suggestions of sand-fluorite-gravel from bottom to top. It may be of
value to point out that some species of algae and diatoms utilize
silica. hence, by adding sand one might contribute to algification of
one's tank when trying your best to prevent it with other measures
(phosphate free fertilizer and buffers).

Damon A. Job
Marine Mammalogist
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