Hi, I have this big rock (and a small one) that I found in my backyard that I want to place in my tank. At first it looks a lot like granite, but is less durable (did not pass the nail test) since it chips off and creates dust when I scratch it with a nail. It is hard enough however to scratch glass? Has a pebbly kind of look to it with a lot of white spots with gray spots within and some small amounts of brown spots. It looks quite a lot like granite though, but upon closer inspection it does not have the shiny crystals like granite. Also when I tried to disinfect it with very hot water, one of the rocks (the smaller one), cracked when removed it from the water which leads me to believe it is sandstone. Like I said it has a lot of white and grey particles which are about even in size (I’d say about 1/16 of an inch). If I’m not mistaken this rock (sandstone) is safe to use in a fresh water aquarium correct? By the way if anyone is in Southern California, does anyone know of a place where I can find some aquarium safe rocks (other than petco or petsmart).
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