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Can anyone help me to identify a mineral/rock which melted in my aquarium? It was a fist sized white rock with grey veins in it. Thought it was quartzite. Vinegar does not make it fizz. It melted down to a few thin chips (pictured below). It only took three months for this to happen. It made the water smell like sulfur and caused a white growth on the substrate that was soft and floated easily when disturbed. (Pictured below). I thought it was a fungus and had to aggressively siphon it and affected substrate out to get rid of it. It did not kill any fish but did affect water quality—because the fish were less active and worked their gills more rapidly. It did kill plants by destroying their roots. Any ideas what the mineral or rock was? Any suggestions as to how I can test remaining chips? I have to admit that I licked it to see if I could taste salt 😝(but it doesn’t have a taste). Just wanting to learn.