Safe subsrate for my cichlid tank

Question
I am starting a new cichlid tank, and was wondering if it were safe if I used sedimentary rocks for my tank?

Answer
Hi Chris,
 In general the answer to that is "no" because sedimentary rocks will break down over time.  However, if you have a large tank (e.g., 80 gallons or something like that) it might work because the volume of water would help dilute the dissolved minerals.  Still, it is a gamble.

-- Ron
  rcoleman@cichlidresearch.com
  Cichlid Research Home Page <http://cichlidresearch.com>