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I've been looking at it for a while and I think one of his fins got messed up. He is having a hard time swimming. I added some salt and turned the lights off. Any other suggestions?

My guppy cobra has been really passive since yesterday, often hiding by the filter of my tank. Today, he came out, and I saw this weird object that looks like it's stuck in his anus. I don't know if it's an object or part of the fish's body, but I'm worried it's what's altering his behavior. Any suggestions or ideas?

I added salt but he died a few minutes after 😞 It was too late I guess. Any ideas of why did this happen and happened so fast? Also what should I do now?

I got three male guppies for my 5-gallon tank less than a week ago. Two are green cobras and one is a pink tuxedo. I believe the pink tuxedo was fine when I got him, but on the second day, I noticed he was much more passive than the other two guppies and was trying to hide often. Today, which is the fourth day I've had him, it looks like his tail has been injured. I've Googled what injured guppy tails look like, but this looks different (it's not torn). It's as if the top part has been bitten off, and he stays in the very top of the tank and swims really slowly. I'm attaching a picture of him from the first day, a pink from yesterday, and a picture of him today. Any ideas of what happened to him? Any suggestions of what should I do?