This is not a goldfish
It is a molly. Mollies are notable in the world of fish for being livebearers: the females pop out sprogs not eggs.
This one was rehomed in our tank for being an old rogue who constantly fathered molly babies, he came with his equally rampant son (who is not gold). They’ve chilled out a lot since they arrived, but that’s because there are no females (that I know of) in their new abode. He looks like he’s got no eyes to me but he’s ok in a freaky kind of way. I don’t know why, but in his new celibate state he puts me in a mind of a wizened old midget monk I met in a monastery in the Troodos mountains…
That’s another story.