We had two Paradise fish in our community tank (at the advice of a not to great garden centre/fish shop.. when we first started in the hobby.. therefore didn't realise that most lfs are not to be trusted...) one male (larger fish with longer tail) and one female (shorter, more round looking with a much shorter tail).
The male was a nightmare
he chased the female until she died
, then started on the rest of the fish in our tank, going so far as to eat the fins off our four stunning angel fish one by one during the night.
In the begining we didn't know who was literally eating the angels alive it only happened when no-one was around - we had our suspicions, but we were convinced by the guy we bought it from that it was "perfect community tank fish", and that it was the two golden gouramis that were also in the tank (they kindly took those off us .. free of charge!)
we've finally got the internet at home, and found that a lot of websites refer to the the paradise fish as NOT SUITABLE FOR COMMUNITY TANKS!! and that they are renowned for chewing angels, and other long finned fish, in competion for the middle-top part of the tank!!
we can completely understand why you chose these fish.. probably for the same reason as us.. they are beautiful! but i hope our advise will help save you some heart ache!
james and kat