Sera actually never pushed Siporax. In fact they had discontinued it. Once it caught on with reef keepers, we started buying up all the remaining batches. They caught on to the demand and just recently started producing the product again. With the removal of sand beds and minimalist scapes, reefkeepers began looking for alternative means of denitrification. When Triton revealed that ceramic medias were leaching metals, the search was on for a product that had no chance of leaching. Siporax being made of glass, was the natural solution. Many feel that Seachem Matrix is also a very fine choice per all I have read. There really is no way to overdo these products. It's simply additional surface area for bacteria to colonize.
