Spasms, frequent gill scratching, and lost appetite following Prazipro dosage

confused_aquarist

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Another panic moment. Since purchase of these killifish half a year ago, they have always had occasional gill scratchings, but I have decided to delay treatment until all of the fry are housed with adults, which is planned for next month.

However one of the juveniles is bullied and now sick. Does not eat, so I decide to treat with Prazipro yesterday. Yesterday I did not see change in behavior, but today I noticed frequent spasmodic movement (see video, I’m most curious as to what this is https://drive.google.com/file/d/1FBVKVvbn2XxZMfuSkd-znjhQqi2Hjemi/view?usp=drivesdk), along with increased gill scratching every 10 minutes or so and now little to no appetite.

I have also decided to treat with metronidazole, since I have had an outbreak of hexamita in the parent tank that killed several fish and left one slightly debilitated after recovery.

Is it common to see increased scratching and spasm of this kind after Prazipro or have I made a misdiagnosis. I was suspecting the bending up spasm could be due to intestinal irritation, hence another reason I decided to add metronidazole. I am so confused.
 

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