ill guppy

Please can someone help, my guppy is around three months old. He was born to one of my female guppies so I had him since birth. These last few days I noticed he was staying by himself and not interacting with the other fish. I also noticed he has a swollen belly so I wondered if he was...

I noticed at the weekend it was swimming close to the surface and not really moving around, the stomach seems very bloated and it’s swimming really strangely. I also noticed a few red marks on the tail, i can’t tell if it’s been ripped or whether it’s red spot? I tried my best to take some...