wasp
Probably the biggest problem with DSB's is that they don't get blamed for what they actually do. Everything in this world from metals, salt mixes, rocks, type of sand, too small of tanks to square tanks - you name it - gets blamed when they don't work.
When the truth would be a whole lot simpler. Read the link that Xx posted. Sand is sand and bacteria are bacteria.
http://www.reefcentral.com/forums/s...2&highlight=DSB