I have a chunk of porous rock I found on the beach in Hawaii that would look good in my tank. It has been dry on a shelf for years. Is it safe for my tank? Any ideas on how to prep it? I have a 2.5 gallon, planted, non filtered, heated bowl that gets twice weekly water changes and a very happy betta. Thanks
Thanks for the the input. I tried the vinegar and no fizz so I boiled it to make sure there was nothing funky on it and it turned out that it took up too much space in his tank. I opted for another plant instead. He likes the plant better too I think.