Maybe not for your fish but I do not let my fish live in that type of environment. It causes stress, heavy breathing and not good for overall health and longevity.
Unless there is no sump, no skimmer, water touching the glass, and the top totally sealed making the tank a biosphere type environment, glass tops do not create O2 issues.
The op has stated that there is at least a skimmer, so that is a high dollar oxygenator.
It will be interesting to know what caused the die off. The smell was definitely the first indicator that something was wrong.
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