only problem i have had putting my wedding band in my tank is the fish used to go nuts and bite my finger...but then again it is highly polished Tungsten Carbide ( it is completely nonreactive, other then to electricity)...i would never expose gold or silver into my tank though, i cant imagine what else is mixed into gold and silver to fill it out...but i agree that your ring has tarnished, either reacting to the harsh salt environment of your tank and the trace metals in your tank water
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