To exchange or not to exchange. That is the question

Hi, I have 4 corys in my tank. I had a JuliI cory, and have recently added a sterbai, an albino and a panda. The three newbies schooled together in qt, but since I moved them a week ago things have changed. The sterbaI now follows the juliI around and the albino pootles around on his own and the panda seems to be a bit quiet. He's eating fine and comes out when the lights are off, but beyond that I dont' see as much of him as the others. Adding more corys is not an option (I'd have a tank full of pandas like a shot otherwise!!), so the question is: do I return kushu and get, say,another albino, or will he settle down?

Thanks

 

What size tank is this? All but the panada need a 20gal tank for one school of their species. Pandas may fit in a 15gal. Cory really need schools of their own species, plus the other cory will get larger then the panda.

 

I am confused, what do you mean settle down? Albinos don't, they are super hyper.

 

Cories never settle down, they are always on the go.

 

He was a total Nutter in QT....gone all quiet since we moved him.

Prob best to switch him for an albino

 

The panda? My pandas are much calmer than my albinos and julies.