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if it is only a 30 gallon tank i would remove the piece of rock and get the fish out of the hole it died in (try holding the rock upside down from the hole and using a turkey baster with tank water to blast the carcass out. If this is not a option, make your water changes larger and more frequent until your parameters come back down... What is your water testing at now? What kind of clean up crew do you have to help with these kind of situations?
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