Hmm? Yeah I heard it was hard, but they've told me that juvie cockatoos can't be sexed. I have successfully sexed 4 now.
I have four sparklers in a 12 usg with a school of 11 diamond head neons, 4 otos, 3 honeys. They are doing well. I know it seems overstocked but I do weekly water changes and they are all juvies. The neons and sparklers are little things. It is the quarantine tank for now, until I decide what to put there.
As I say I don't know how they will act when they come of age. They are fine now. It is hard to find info on them. I saw one back a neon off who came too close or tried to nip or something. They can take care of themselves.
Hopefully we'll get some more posters. Joe said sylvia is a good source. But she isn't around so we pm'd and emailed her.
That's good to know about watching their behavior. I know now not to put them in the big tank. I'd never get them out.

Although they probably have enough room to spread out.
I'm inclined to think the big thing about small tanks with a male and several females is that the females need enough room to avoid the male.