Geezer From The Freezer wrote:


Silicates will play havock in your tank, you will get a brown algae (diatoms)
bloom in no time at all! Silicates will leach from this type of sand!

Your tank is made mainly from silica, glass is a mixture of SiO2 with
various other oxides (Na, K, Ca, B) mixed in to lower the melting point.
Also, silicic acid is a common compound in water.

Phosphate and nitrate are more of a problem, though.