So last thursday we had a power outage here down in olympia.... i lost some water volume from my tank due to a faulty syphon break...my tank is a 140 with a 90 gallon sump...i run it pretty much wide open as in skimmer runs non stop ... return pumps on both scwd and main return run wide open no down time... any way so after the power outage i added water and returned the salinity back to my normal operating parameters..so now the water and the sand are turning black ... all the fish died two clowns, a tang, a six line and purple psuedo...still got a couple of corals that havent succumb but they are acting wierd probably gonna remove them to another tank tonight...my question has anyone experienced a phenom like this before.... i have had minor crashes but this has killed everything from shrimp to snails to bristle worms, featherdusters, hermits everything....I have a ceath tank and will be breaking it down and reorganizing my reef efforts....I have had this tank for many years and its been flawless...it has been a great tank all along... It alsmot makes me think i had a pump go bad and shock the tank but there all gen x pumps and never had that kind of issue....anyway any hlep or suggestions will be appreciated...