it could be that other fish are fin nipping or it could be fin rot i would recommend that you put him in another aquarium or large bucket with a heater and also put aquarium salt in the water the salt protects him from infections.
hope that it helps.
Males have longer, more colorful fins, females can be smaller.
You can find the gender of a guppy by looking at the anal fin. The anal fin is the closest fin to their tail below them. On a female it will look like a normal fin but on the male their will be 2 long skinny fins. The male is also much more colorful.
Every part of the male Guppy helps him to attract a potential partner who will let him impregnate her. From his size, to his colouring, to his fins it all counts. However the actual bit that transfers his milt (sperm) into her is called a "gonopodium". It is a modified anal fin situated on the underside of the fish between the ventral fins and the caudal (tail) fin
Your male guppy is female and with child.
All that is needed is a male guppy in with her.
it may be a femake or a FAT guppy
It might want to mate with it.
yes there are. that is how they get mates.
That does not happen with guppies. They stay the same sex for life.
To impress the females
what u expect? a miracle?????? Actually it's possible if you recently purchased your females from a pet store or your male recently died. Female guppies can hold sperm from a male guppy for a number of birth cycles.
If the fish has a "GONOPODIUM" it is definitely a male.