Is this product any good?? I add it to my tank once a week. I have noticed red slime algae on my sand bed since I started using this. I add about 1/8 teaspoon to a 90 gallon tank.
Black Powder is blood meal. It is a supplement used to feed house plants. Like most Marc Weiss products it will cause problem algaes. I'd suggest NOT using any Marc Weiss product. Search the archives of this forum for more information.