The recent year had more & more evidence coming out against the long-term viability of the DSB. The about-face turn by a major authority & proponent of the DSB in the USA is also deeply disturbing. It's still a fantastic natural nitrate-reducing method and provider of natural zooplankton but recent evidence shows that it does contribute to 'old tank syndrome'. It seems like a big enemy of the reef tank, phosphate, will leach out over time... a major consequence of the DSB bein