I recently acquired a saltwater aquarium from a friend. He had it for 15 years. 25 gal tank I believe. When I was setting it up I set up the canister filter the wrong way so it didn't receive the proper treatment for a few days. Lights didn't work for a day or two after I got them. Everything is fine now except for the tank itself. Rotten egg smell, which I know is Hydrogen Sulfide. Got some snails and crabs but they haven't moved. Haven't even seen the crabs. All the coral in there is dead. Should I take the coral out? I've been doing water changes and it's helping the tank clear up. The temp is right around 76 degrees and the salinity is 1.024.
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