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I was wondering if anyone can help us. We bought a used canister filter, we cleaned it pretty good and bought all new filter media. I heard canister filters are bad for salt water. It was used for freshwater before. Our anemone recently died and then today all but one of our fish died...

I recently set up a thirty gallon tank, we bough it with live coral and sand, we bought it used online, they had an older filter but it seemed to do ok. we first started by adding a blue damsel and sea anemone. Everything seemed to be doing ok so we bought some hermit crabs, sand sifting star...