Polished stones okay with fish???

[angelfish11]

I have a 29gal tank with:

4 zebra danios-1.5 in
2 angelfish-nickel sized bodies
2 bolivian rams-3 in
1 siamese algae eater-2 in

My Ph is 7, ammonia and nitrite 0, and nitrate around 8.
I was wondering if i could put polished stones in my tank, or would they have harmful chemicals? would they harden the water or raise the Ph? Also, woul quartz be OK? All help would be appriciated.

Thanx,
Alex:c2:

[angelcakes]

i dont know but hello and welcome :19:

[smaug]

any polished stone that isnt calcitic would be fine.Even then it wont poison anything it will simply raise your ph.Oh yes,BTW welcome to the site.

[sailor]

Hi and welcome to a great forum and community.

[angelfish11]

What about quartz???:c12:

[angelcakes]

i think you might be alright with small pieces im sure ive got rose quartz stones in my tank if not then there similar,

[angelfish11]

why do they have to be small??? why not big?? and, would they raise PH??

THanx,
Alex

[DragonGoby]

Hi, and Welcome to AC....
Quartz is not a problem in a tank, it won't raise your pH and you can have a big or small piece, depends essentially of the space you have in your tank...
The problem is more about edge, which can hurt fishies sometimes... But if they're polished quartz their's no problem...

But if your quartz have others minerals on it, be careful, some can be harmful like pyrite and some black mica, they can release heavy metals in your water....

Best of luck with your tank, and once finished, maybe you can show us some pics?:19: