This depends on what environment you're hoping to keep the fish in. Hardy varieties, including singletails and sometimes fantails, will do far better in ponds than more delicate varieties. Fancy varieties are often smaller and produce less waste and are more suitable for small environments. Tanks with many decorations may be dangerous for bubble-eye goldfish due to their large, fluid-filled sacs, which can be pierced and damaged by sharp objects. Sight-impaired goldfish like telescopes/moors and celestials may be best in a tank with open space and with few competitors for food. The best goldfish depends on what you personally are seeking.
No, goldfish are best with goldfish. In addition, tilapia have different needs and are quite likely to be aggressive towards the goldfish.
goldfish. Definatly goldfish. Or betta
In late spring of early summer is the best time to breed goldfish.
The best and only good tank mate for fancy goldfish, are other fancy goldfish.
Goldfish are mostly the same wherever you buy them.
The common goldfish because its fins are not too delicate
Goldfish
bruce
goldfish
Ghost shrimp are the best shrimp to add to a goldfish tank for optimal compatibility and health of the goldfish. They are peaceful and can help clean up leftover food and algae, benefiting the overall tank ecosystem.
Betta fish are best as a solitary fish and are not compatible with goldfish.
People consider Goldfish as good friends too. But they are fishes and cannot socialize back.