Issue was resolved, both the lyretails died. All signs point to velvet, as once I finally got one of them out it looked dusted all over when in direct light. Both had been hiding in the rocks so while I thought they visibly looked fine, it was another story when the direct lighting inspection happened.
The rest of the fish started showing signs too, the blenny being the worst but he pulled through. Putting it all together and realizing that my dates were off on purchase and post tank-transfer QT length (posted that after a rather stressful evening), the only culprit that added up was velvet.
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