Why is my oranda goldfish chasing my other goldfish?

I recently upgraded my tank from and 10 gallon to 45 gallon. I finally got the tank set up and moved my black moor in to the tank. I then decided to get two more goldfish. I just got them today, a oranda goldfish and a different whitch I don't really remember the type though. The oranda didn't have any aggression tords the other fish I got. But when I put them in to the tank he went around the tank for a wile but then started chasing the other fish. I have read that it could be 3 things, aggression for territory, playing, or matting. I also read it could lead to DEATH. I'm worried for my black moor whitch is very important to me, and also the other goldfish I got. I would like to know how to stoping the oranda befor any of them get hurt or even die?
Inga_kawaii
Asked Jan 03, 2016
Technically speaking, it is not advised to house different types of goldfish together, so if I were you and valued the black moor that much, I would move the moor back to the 10 gallon, and leave the other 2 fish in the 45 gallon tank.
EmoWolfie
Answered Feb 03, 2016
Great job on upgrading ur tank! Forty five gallons is only big enough for two full grown goldfish though! I reccomend twenty gallon per goldfish, Petsmart has thirty dollar twenty gallons, move a black moor into a twenty not back into a ten!
Petzfurever123
Answered Feb 21, 2016

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