wow..thanks for the imput...i do weekly water changes so i fig my mag levels would be replenished from any depletion...i do have a mag tester and addative so i will check that tonight....i am glad to hear that it doesnt seem to be a disease of some sort....i thought sneeyatch's point that the zoox could produce excess oxygen interesting...along with piaktons point that it would be a much more common occurance among hobbist if it were high levels of po4...thanks for all the help david
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