Ok went rock hunting today through the city, around creeks, rivers and landscaping stores today. Most are soaking and I got for free. My question is the landscaping place had some white rocks that I have never used and wanted to know if they were aquarium safe. They are the big white ones that you see around drains and bridges near creeks or other bodies of water. Will these be ok with the usual soaking and treatment or do crazy things to the water?