BufferPlus 6 oz., Caribsea Buffer Plus Still using the same old buffers? CaribSeas Buffer Plus is the easy way to buffer and remineralize marine and reef aquariums. With both bicarbonate and time release aragonite buffer, Buffer Plus gives you the fast alkalinity adjustment and pH support you expect, as well as the long term stability you need for a healthy marine aquarium. Buffer Plus also contains calcium and trace elements such as strontium and magnesium for robust and vibrant corals, invertebrates, and coralline algae. Step up to the new technology of buffers, Buffer Plus.