I'm still trying to figure out what to mix my fluorite with (50/50 mix ...
to save money) and since dark substrates are usually considered best, I was
wondering if anyone knows of a source for dark gravel in Toronto, Canada?
I'm only interested in stuff that won't affect the water. I don't mind
using fake gravel (coated), however, everything I've come across so far is
larger than the 2-3mm recommended size for planted tanks.

Thanks,
Harry