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First question; what is needed to be done for a filter who currently filters freshwater to be switched to salt water? (the filter says it can do both on the box) I have heard to soak the filter media in boiling water to start over again...
Second; How fast will a 100 gallon filter cycle on an established 30 gallon saltwater tank?
Third; Will the gravel in a freshwater tank need to be removed and replaced whith sand or can the gravel stay in the tank?