I know exactly what smell you are talking about. It's crazy how quickly the entire situation deteriorated. Even after I had power restored and did a water change + replaced carbon, corals have kept on dying.went through same Pretty much losing everything and walking in to house with the smell I knew exactly what had happened before I’d even set eyes on tank,was gut wrenching,took some time out and then thought I love this hobby love the buzz of it had a trip to states and a few good lfs and set up again on my return home and so glad I did hang on in there and get back into it,good luck