Black powder?

[bulletsworld]

In the past I purchased Marc Weiss product Black powder & Combo Vital for my reef tanks. Actually I just gave both products away for free a month back. I thought they were both a waste of money honestly. I did find the additives were a bit pricey and didn't find that I had fabulous polyp extension or growth, when I spot fed. Thinking back I did have cyna bacteria in those tanks at that time, but can't be sure it was because of those products.