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Re: Cement Bricks @ Home Depot

 Ed <ed at pattravers_com> asked about using these in aquaria.

If you're really talking about cement bricks, the portland cement
within them will leach alkalies in to the water.  If you change water
oftern enough, or if you like hard, alkaline water, then the bricks are
for you.  Note that "cement ponds" aren't just something Granny
Clampett found out back.  Cement is often used to make koi ponds and
those fish don't seem to mind.

If you have very acidic conditions, that will wear on the portland
cement  -- just like the rain on New Jersey sidewalks.

Scott H.

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