Does the goldfish tail gives a disadvantage to the goldfish?

There ancestors are gold... different colored traits over time dominated the classic gold color, while in some breeds, the gold color will dominate during the trait selecting process

Yes, you can give your goldfish some bread, but the bread has to be cut into very small bits. Also keep in mind that not all types of goldfish will eat this bread, only some types do. The best food...

If you provide good, clean water and enough of it, the fishes tail will grow back. There would have to be a reason for the fish to loose its tail. The most common reason is fin rot (fungus) this is...

There is no rule against it but by cross breeding different 'types' of fish you are producing fish that are potentially worth less than the possibly pure bred 3 tailed parents. Purists would say you...

no