Kaudern's/Banghai cardinal question

[matth2181]

Do these need to be kept in groups or kept singularly, I'm hearing different things, wondering if anyone has some input or owns them? Thanks.
Matt

 

[bang guy]

They can be kept single or as a male/female pair. Sometimes a group of all females can be kept but it's not a sure thing. Multiple males cannot be kept together.
Juveniles will shoal but they mature quickly.
I recommend a male/female pair.