CA's are fun to, you'll just see later on that you'll have to thin out a little, you'll know when
I'm shocked that Nics have a reputation as being a good community cichlid to be fair, i only ever hear bad things about them from other forum users (when mixing them with others).
Another issue maybe cross breeding, the con, jd, and nic will breed if they are opposite sex's, which could mean dooms day to the others lol!
Many people confuse CA's with SA's thinking that they need to pair off, from experience this certainly is not the case, some are more prolific than others, but it does seem that no CA cichlid can resist the charms of a little female convict, luckily you don't have one
I had to get rid of a beautiful little female convict a little while back because she would breed with anything that was CA and male, i was constantly getting rid of things to accommodate her, then the little hussy would just move on to her next.
If CA had CSA, she would be the male fish worst nightmare lol with possibly over 500 fry over 6 months from 3 fathers of different species of fish (Convict, Sajica, JD) and she was still under 1.5" !!!!!
Do you know what sex your JD is?
The nic will be brighter colours if it is female (yellow and blue) and the JD will have most of its 'pearling' on its gill plates and less on the body if Female.