Hey all, well I'm usually a betta fish section poster, but I figured I'd get more responses here so here goes:
I want to have a kind of "crystal garden" theme for my newest 5 gal betta tank. After thorough research I've found out that the only thing I'd really trust is crystalline quartz since it's composed of only silica and oxygen. However, there are several varieties of color that come from impurities in the crystal which results in rose quartz, smokey quartz, and several others. I know amethyst is out because it contains calcium and magnesium (I'm pretty sure that was what it was) which could leach into the water, but nothing I've read has said anything negative about the other types. Being the worrier that I am, I only want something that is 100% safe so I'd like to know if anyone knows if these varieties are safe for aquariums. If no one knows I'll just go with plain quartz to be on the safe side.
Oh, and if anyone knows of other crystals that are aquarium safe feel free to add. I found sites with whole lists, but some of the info conflicted so I didn't trust them.