I'm adding some fluval biomax to replace some rocks over time. I was planning to drill the holes to make it 3/8" but noticed gray dust that looks like aluminum. I've seen discussion that biomedia may leach aluminum into the tank and wanted everyone's thoughts on the gray dust. Photos are provided to show the dust and materials used to drill. I could not find any information on what it is made of and should I be concerned about using this product?
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![20230307_143949.jpg 20230307_143949.jpg](https://test.reef2reef.com/data/attachments/2980/2980906-c8866041986e6e52afaa5e6648ccc5dd.jpg)