convict cichlid & jd's

Today I purchased what was spouse to be 4 jd's I realized when I got home that they all weren’t the same. There was one fish that was different I don’t have a picture of the fish so I searched the web and found this pic
http://www.fishpalace.org/A_nigrofasciatus.html

It looks just like him so im pretty sure this is what I got. I have the 55g with 1 clown knife fish @ 3in, 3 JD's @1/2in - 1 in, and this convict @ 1 in., I plan to move them to a much larger tank latter but there all very small now. I was just wondering what kind of luck I might have if I keep the convict I’ve read they can be vary aggressive. It’s only been a few hours and things seem Ok but im sure it’s too soon to tell.
So I’m wondering if it’s best to bring him back?

 

JD's and cons can get along provided the tank is large enough and none of the fish are really hyper aggressive.

And out of curiosity, how big of a tank are you planning to upgrade to and how long do you think it will be? You said 400 - 500 in a previous thread; is that still the plan?

That clown knife is going to get absolutely huge. So combine that with 3 JD's, a con, and the 2 pacu (assuming you're wanting to keep them all together, you're going to be needing around 800 - 1000 gallons.

And are all these fish (the JD's, con, knife, pacu, and africans) all in the same 55 gallon? Are you still having problems with the pacu?

-Chelle