jetajockey
come get me tang police!
fritzzyme and dr tims actually have some science backing them up so I wouldn't call them useless. There are lots of solid test results out there, and those two particular products contain the same bacteria found in an established tank, so it's not just dumping in a random chemical and praying. However with any living organism there's no certainty with how things might work out so don't put all your faith in it.