Not sure if there's any truth to this, but when I added volcanic rock to my
tank (back when it was a fish-only tank) I had an increase in nitrates ...
one of the LFS said it was caused by the volcanic rock, so I took it out.

I know another fish owner who used tufa (sp?) rock as a base rock with
success ... personally, I used live rock throughout.

"Dan Norgard" wrote in message
...
Hi;
Can Volcanic Rock be safely added as a base to the LR in a cycling tank ??

Thanks,

Dan