Did you cleanthem?(as in scrubbing, boiling,bleaching, rinsing)
If it is limestone, it will slowly dissolve, and harden your water.If it has metals in it, they can rust, rust is never good for aquariums. Ifit ain't to sharp, or jagged fish should be safe.
But it is always good to clean you're rocks. Got any pictures?
If it is limestone, it will slowly dissolve, and harden your water.If it has metals in it, they can rust, rust is never good for aquariums. Ifit ain't to sharp, or jagged fish should be safe.
But it is always good to clean you're rocks. Got any pictures?