I just bought two new straight tailed goldfish and put them in my tank with a ryukin will that cause problems?

Answer 1

The body shape of the ryukin prevents it from swimming as fast as the common (straight-tailed) varieties, so the major problem might be making sure the fancy gets enough to eat.

Other than that, the only problem I'd see would be one of size. Goldfish will sometimes bully a smaller fish. So as long as you keep an eye on them, make sure the fancy gets enough food, and there's no one harassing him, it should work out.

Answer 2

some will.