<a href=showthread.php?s=&postid=10952404#post10952404 target=_blank>Originally posted</a> by anjhof
I have several pieces of tufa rock in my set up and honestly I can't tell the difference within a couple of months from the other rock. Not sure about what Calfo talks about - although I am sure he is correct. Regardless though, if you only have part of your rocks as tufa rocks, you should be fine.