Country joe
Fishaholic
Is this any good for tropical fish, or is it snake oil?
Sorry about already asking this, when you get into the 60s the memory not as great.You raised the same question in August. It can be useful, depending on what you want to do with it. Blackwater extracts and teas have been used by breeders since the 1930s. This just seems to be another recipe.
You can create your own for a fraction of the price.