"Slate" rocks for a Tang tank

Ok I know that it does not occur that much in the lake but it sure looks great...

Who has used slate rock before and what are the pro's and cons?

 

pro comes in thin easy to stack pieces, does not leach, dark color highlight fish colors
cons hard to find with natural look, and gets dam slippery when in tank for a while

 

OK cool so no adverse effects on water quality?

 

has not altered my water and i have done that vinegar test as well with no bubbles
if it does tangs like the water hard anyway

 

Ok thanks... Guess I will be out shopping for rocks this weekend...

 

I think @Franna used it in his old tank.

 

i have couple of small pieces

 

@francoisve please let me know if you find it around. Also on the hunt for it.

 

I am surevthe landscaping place on lynwood rd will have.. going for a look tomorrow