What are the current water parameters? pH, NH4 (or NH3) Nitrate, nitrite etc. Do you use any CO2? How long has the tank been up? It could be possible that your substrate has gone totally anaerobic and caused some problems or that the pH dropped so low as to wipe out the bio-filter.
Brian Ahmer ahmer.1@osu.edu http://www.angelfire.com/or/biggestbri
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