If you have microfauna inside your rocks (e.g. pods), or bristleworms, tiny starfish, etc. inside the tank... You might be smelling die-off from those animals. Which, given sufficient quantities, could be problematic as their decomposing bodies could lead to an ammonia spike. You can't use ammonia reducers w/copper, so I would have lots of freshly mixed saltwater on hand in case that badge turns green.
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