Actually (I just found out) black water extract is from catappa, or indian almond leaves...Also knowns as IALs. Breeders use it for fish, to help harden scales and condition the breeding water. It lowers PH, and makes it ideal for such fish like Bettas and Arowanas ^^ Some breeders/hobbiests use it with IALs.
Breed for the breed, not for the money; the words any REAL breeder would understand.
You must know nothing in order to know all, for all is nothing and nothing is for all.