Shale?

[BadKarma99-4spd]

i have an ample supply of shale in my backyard and have taken some pieces to wash and boil. after doing so the rocks seem to flake really easily.

does anyone know if shale will be alright to have in my aquarium?

not break up in the water or effect ph?

thanks

 

[MartinB]

I think shells, pieces of coral and calcium rich rocks can't be used.

most rocks are okay. The best way to test them is this: collect your rocks and wash them well.
Boil them on the stove for about an hour, just to ensure that no living critters accompany the rocks into my tanks. Then, pour a little bit of white vinegar on the rocks. If they fizz, they're no good. If they don't, you're home free.

 

[BadKarma99-4spd]

thanks, ive done that and they dont fizz, im just hopeing they dont come apart in the tank as the rock seems rather fragile

thanks again