I hope the metronidazole helps.
I can't say much on a personal level about that particular protozoa but I can say this:
My mud turtle once had an unidentified protozoan infection, he was treated with that drug & was fine. He showed symptoms so he got sick from it but it cleared up quickly. His symptoms were lack of appetite and listlessness.
Not too long after we got the tortoise another unidentified protozoa was found in her. She had no symptoms but she was cleared up in a few days too. I haven't really dealt with severe symptoms in a chelonian.
The drug worked wonderfully for both of mine.

We now test the tortoise monthly during the warm months when she's out grazing, we test the rest of them routinely once or twice a year. If they were to show some sort of symptoms we'd test sooner.

If the vet does find the answer through necropsy & testing, please let us know.
I'm sorry for your loss.
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PHRatz

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