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Yes you can, but you will kill the bacteria (different between salt and fresh) and get die off which will produce ammonia and start a cycle or mini-cycle. Why do you want to run a canister on a SW tank? What size, how much LR, how long since setup, etc.? Please give us details on the tank.
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8G Peacock Gudgeon, 75G CA/SA cichlids, 120G Planted, 50G Mixed Reef ( Build). 125G Reef and 100G frag tank in process.
Save the reefs... Buy captive raised when possible!
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