If your goldfish has red patches, is losing its tail and has a fin clamped shut, this could mean that it is sick. You should take it to a vet if possible.
no it will not but it would attack if it or it's babies are threatened
it might not eat it but it can bite it's tail or harm the fish
A guppy will be small ish and very colourful, with colour all over the body for males and on the tail for females.
Yes, and generally have a longer tail.
No, he will get killed by the guppy.
Their tails. Guppies have amazing tails. The males have bigger and brighter tails whereas the females have smaller and less bright tails. You can get all types of guppy babies. The best thing is you can mix and match the guppys too. If you have a leopard guppy and an orange guppy and they breed, the babies tail looks like an explosion of yellow and orange in a leopard tail.
Tail
Absolutely nothing.
yes it will grow back so don't worry
Female guppies are larger and plainer. The male is distinctive for his long, flowing, colourful tail and generally brilliant colours.
it will have a fan tail by the begining of its tail, they are generally bigger than a male and males have alot more color than a female.