Re: sulfate in freshwater tanks

>From: Craig Bingman <cbingman at netcom_com>
>Date: Fri, 17 Jan 1997 13:11:44 -0800 (PST)
>I've heard some of you saying that sulfate is a potential problem in 
>freshwater tanks due to H2S production in the substrate.  My question to 
>you all is: how well documented is this?  At what concentration does 
>sulfate become problematic?  

I don't consider myself an expert in this area, but my understanding is that
sulphates can become a problem with an anaerobic, organic substrate and low
nitrates.  I've set up my systems with a manifold in the substrate to allow me
to oxygenate my substrate if decomposing roots begin to evolve H2S as my tank
reaches a mature level.