LCA Tannin Plus contains a specialised mix of tannins and a water softening agent.  It can be used to create natural looking biotopes (habitats) for South American fish species and increase acidity, providing an environment that mimics their natural habitat.  Tannin-rich waters can also induce breeding and provide fish with other health benefits.  The Calcium de-ioniser in LCA Tannin Plus assists in softening your water while removing toxic Calcium hydroxide.