Fireplug
Reefing newb
I have my 30 gallon fowlr and we bought some dead coral for decoration and added it today. It was in the live rock tank at the fish store. I removed some live rock from the tank that belongs to my step mom. But anyways the water level was down so I added less then a gallon from the faucet (well water). Then I left the house came back in an hour and a damsel was dead. The water has a strong sulfur smell like it does from time to time. Is that what killed it? I have a clown and another damsel which are alive. Been in there for 5 hrs now. What to do? Are the other fish ok since its been 5 hours and water has been running thru the carbon hang on back filter or are they doomed also?