http://forum.aqua-fish.net/ A forum devoted to aquarium fish, plants, techniques and fish keeping as a whole. en http://forum.aqua-fish.net/?topic=exotic-rocks-how-can-i-test-to-see-if-they-will-hurt-my-fish-#1 I just acquired some large stones with fossils in them and they come from Morocco. They are polished on some areas and raw on others. Is there a way to check if they will affect the ph or anything else in my tank ? And what should I clean them with ? I'm not sure about boiling them , bc I dont want them to crack. thanks in advance kino 2010-02-01