Suggestions for praecox rainbowfish who is pushy

[spottea]

So, I have had this praecox for quite a while. The rest of his group have gradually died, unfortunately over time. He's in a 40G breeder tank along with a shoal of rummynose tetras, 2 brilliant rasboros, some corys, 1 danio margaritatus (his buddy died too) several ancistrus, 2 L333's, and a chain loach.
according to Aqadvisor (what a fun tool!) the stocking is OK, and it doesn't seem overcrowded because many of the fish are hiding a lot of the time under logs etc. But, I don't want to add to all the middle tank groups of fish, as then it would be overcrowded.
the praecox is chasing everyone else constantly, so they can't really settle. He isn't pecking at them, just herding them.
Therefore, I plan to either get more praecox, so he will be happy, or take him to my LFS.
Or, get more brilliant rasboros somehow, even though I never see any in the stores, and return the praecox.
I would also like to get a couple more chain loaches as they are happier in groups. I hesitated to do this at first, as I was afraid he would bother the corys. But, this doesn't seem to be the case.
I also have two filters running, a Fluval and an Eheim, so water quality is good. I used to have a sailfin plec a few years ago, so I needed the extra filtration! I miss him though.
Anyway, all friendly advice welcome.

 

[Fishfriend1]

I'd rehome him (to a lfs or another fishkeeper). They generally prefer to live in groups of 5-6 or more, so it wouldn't work well in that tank.

 

[Byron Amazonas]

I agree. And even in a larger tank, adding a full group might not solve this problem.

I have over the years had similar situations where the group of fish eventually die from old age or whatever, and one or two may be left. Sometimes at that age they seem to be fine if left in their established environment. I would acquire more if it was a species I wanted to retain, and they are available; but sometimes we just want to move on with different species.

Once a fish begins to get aggressive, which is due to stress caused by not having its conspecifics, it often doesn't revert back even if others are added; it may lash out at them. Once or twice I have had this problem, and removing the fish was the only course of action or the other fish in the tank would get stressed and that means more trouble. Fish stores do not always want to take in old trouble fish, so euthanasia is sometimes necessary.

Byron.