Quote Originally Posted by JimD View Post
Think about this, they use silica sand to make glass, is your tank a glass tank? Silica based sand is not generaly a cause for algae associated with diatoms or any other algae unless its been contaminated or polluted, if this were the case, all glass tanks would have this problem. Just give it time, with proper maintenance it should go away.

With the glass, the silica would have been bonded together when the glass was made so I don't think it would leach out the way it could through the sandbed. Or at least not to the same extent. Either way, the silica sand issue is one of those never ending debates.