I read that copper is bad for nerites. I am wondering if rooibos tea woud harm them. I did some research and supposedly there is .09 mg of copper in one cup.
My nerite is in a clearwater tank but my blackwater tank has plenty of MTS and they are fine with rooibos.
FWIW don't fall for the organic marketing hype. The plant is so sensitive it won't survive if its not organic - so save your money and buy the cheap stuff (if that's an option in the US)