05-20-2013, 07:20 AM
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Phospate reading looks high. Maybe you need to run a little GFO to reduce that and the chance for algae...
I am not sure why the clown suddenly died. He did not show any outward signs of stress or disease? I have had perfectly healthy fish die on me suddenly, so it is not impossible. Clowns, however tend to be a more hardy species and do not really just die off for no reason. I am not an expert by any means on fish disease and don't want to give you a false diagnosis.
Where is your source water from? If it is from the tap, this could be the problem...