I'll make this short and sweet.
I have a few questions about the charcoal used in substrates.
1. Is it the same, in theory, as aquarium activated carbon?
2. Can the aquarium carbon be substituted? If not, why?
3. I've read that the charcoal is all natural hard wood charcoal. Being a furniture builder, I have plenty of scrap hardwood. Can I just make my own?
Many thanks,
Abran