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No, this is quite common in goldfish and isn't anything to worry about as it poses no threat to the fishes health.
Simply a marking on the fish. Do not worry about normal marks.
Some common breeds of goldfish are: the Black Moor goldfish, the Ryunkin goldfish, the comet goldfish, the common goldfish, the Calico Fantail goldfish, the telescope eye goldfish, the bubble eye goldfish, the pearl scale goldfish and the Oranda goldfish.
Goldfish do not have teeth.
Yes. It should be fine. I have 2 regular goldfish living with a bubble eye goldfish and to fancy fantail goldfish, so I think it will be okay.
There are many different types of goldfish. The Comet and the Common goldfish are often the ones most seen. Black Moor, Bubble Eye, Butterfly Tail, Celestial Eye, Fantail, Lionchu, Lionhead, Oranda are some other commonly known goldfish.
Provided that you do not have a singletail goldfish in your tank as they are faster more aggressive swimmers. Also make sure you check all your tank decorations to ensure that the fish cannot harm themselves on anything sharp or pointy.
yes it is quite common for white cats to have one green eye one blue eye
water
yes, they will eat them and become eye eating menaces. remove the goldfish to a safe location for extraction. Black Bear will meet you soon.
Your goldfish is suffering from exophthalmos also known as pop-eye. Pop-eye can be caused from bacterial infections, tumors, or bad water quality.
A telescope eye goldfish is in the fancy goldfish type, and most fancy golddfish get up to a foot long (with proper care).