Guppy with protruding lump

[Guppymai]

Hello,

I’m afraid my favourite guppy has become quite ill. I’m fairly certain at this point that it’s probably fatal, as it has gotten a lot worse over the past 8 hours. I’m wondering what might be the issue so I could potentially save the other guppies in my tank. I’ve attached photos - I took her out of the tank to stop it from spreading.

Last week I lost 2 other female guppies, also with slightly protruding vents, but nothing as severe as this. They seemed to have slightly protruding scales - as does this guppy.

 

[Guppymai]

Forgot to mention that the water is green as I treated the tank with Sera Omnipur when I noticed she was lethargic. Parameters are all within a good range, perhaps general hardness is a little too high. The tank has been cycling since March of this year

 

[fish48]

it looks like dropsy probably not curable

 

[Sparx]

Agreed, this does look like dropsy but wouldn’t want to assume as I’m no expert.
This article has some good information, perhaps have a read and compare it to what’s happening to your guppy

Diagnose and Treat Dropsy in Your Aquarium Fish

Dropsy in fish, also called bloat, refers to fluid build-up in a fish's body. It often indicates an underlying disease. Learn the causes, treatment, and prevention of dropsy in fish.

www.thesprucepets.com