Are moss rocks harmful to fish ?

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We are planning a waterfall and pond using Aquascape, and we like the
look of large moss-rock boulders. Heard that moss rocks will increase
the pH level in the water and be harmful to the fish.
Any comments on that ?

Any other rocks that should be avoided in a fishpond ?

[~ janj]

On 4 Jul 2006 14:39:16 -0700, wrote:

>We are planning a waterfall and pond using Aquascape, and we like the
>look of large moss-rock boulders. Heard that moss rocks will increase
>the pH level in the water and be harmful to the fish.
>Any comments on that ?
>
>Any other rocks that should be avoided in a fishpond ?

All depends on what the moss rocks are made of. If cement, it is possible.
Moss itself will not increase the pH. ~ jan
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Also ponding troll free at:
http://groups.google.com/group/The-Freshwater-Aquarium