Base Rock

I have made a lot of base rock from crushed coral and a concrete mix. I had
to "rinse" the rocks in trashcans in the yard for about a month before the
levels came to 0 but it works great and super cheap. (for $20 you can make
about 100 pounds). And I also use small pieces to start frags on, most
that is exposed in my tank now has coraline on it and you cant tell the
difference. You can find recipes on the net.
"Dan Norgard" wrote in message
...
Hi;
Can Volcanic Rock be safely added as a base to the LR in a cycling tank ??

Thanks,

Dan