http://www.orchid-supplies.com/potting_supplies.html
They have both smaller and larger pieces of charcoal. I use the smaller ones like a substrate, and then put the larger chunks on top to use to feed off of. I also use LECA as the substrate (still use the larger chunks on top of this to feed from), and actually like it a little better but it is more expensive.
They have both smaller and larger pieces of charcoal. I use the smaller ones like a substrate, and then put the larger chunks on top to use to feed off of. I also use LECA as the substrate (still use the larger chunks on top of this to feed from), and actually like it a little better but it is more expensive.