Who needs the time out

[no1bubba]

my large mandarin is beating up smaller mandarin. Both added same day. Do I isolate the wounded fish or the bad boy.

 

[Sugar Magnolia]

The larger one.

 

[nereefpat]

If you don't have 1 female and 1 male, they may not ever tolerate each other, especially if the tank isn't huge.

 

[Uncle99]

If you don't have 1 female and 1 male, they may not ever tolerate each other, especially if the tank isn't huge.

Yup, this^^^^^would be a problem.
One per rank is best

 

[davocean]

Pairs or even harems for a male are fine,(providing you can provide enough pods) but can't have 2 males, and sometimes the spike has been bitten or broken off, so sometimes it's not obvious to have a male.