Just be careful and be confident that the fish is surely on its way out. I recently euthanized a fish because it was behaving the same way one of my other fish was behaving right before it died.
Then another fish started behaving the same way. I didn't have the heart to put down another fish at the moment, so I went to bed. The next day, that fish was perfectly healthy. Still is today, and this was like a month ago. So I put down a perfectly healthy fish
What happened was I suppose this fish got sick and weak, because it got sucked on to the filter. I noticed him sucked around it, so I shut it off and took him off of it with the net. His skin was ripped, his eyes were wide and black, and his body was rounded like he was still stuck around the thing. He just floated to the top and I figured he was dead but I saw his gills and mouth moving. Then my other fish started trying to eat him alive! I put him in the net to keep him alive while I figured out how to euthanize him. Thank you for the help you guys, I hope he didn't suffer too long. I don't know how long he was caught on the filter
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