Crabs McJones
I'm so shi-nay
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Honestly I would have moved him over to qt and treated there. I never dose anything in the display tank solely for this reason, you just never know how your corals will react to meds. Im guessing the prazi depleted your o2 content. Very sorry for your losses but get the qt setup and start treatment with antibiotics. NFG is your best bet as it's a broad spectrum that treats darn near everything. Also food soaked in vitamins to help keep your fishs immune system up to fight off infection.
Good luck!
Good luck!