Has anyone ever checked a quarry for rocks that mite contain minerals that would be good for plant growth? i know many people buy inert gravel there for their tanks but i was just wondering if any of them would be similar to onyx sand or something along those lines. i know it mite sound like a silly question or else everyone wouldn't be wasting their money on the more expensive commercial substrates but i felt a need to ask it anyway.
thanx heaps
Tin
thanx heaps
Tin