Folks, if you've recently upgraded or renewed your annual club membership but it's still not active, please reach out to the BOD or a moderator. The PayPal system has a slight bug which it doesn't allow it to activate the account on it's own.
I have a Yellow,Purple & powder blue in my 120. I just added the purple the powder went right after him. But after about 20 mins the purple had enough and fought back. And now they are all best friends.. Like everyone else said add them all at the same time you should be ok.