mud you got them all wrong lol besides the convicts.
convict:4 to 6 yes
but
EBJD can get as big as normal JD which for females is up to 8 inches ( females are harder to get for ebjd ) males can but takes years get up to 10 to 12 inches
normal JD females up to 8 to 9 inches and males up to 10 to 12 inches
HRP get smaller then convicts so around 3 inches full grown ( if its bigger you most likly have a hybred mix of con/hrp )
to the OP:
i would get a salvini ( males can get up to 8 inches ) or a female red devil ( female as they useally top out around 10 inches *some may get bigger but most dont* )
or just do a single EBJD if you want but with no other cichlids, get some dithers as in danios or some other barb type fish ( danios arent barbs though ) and EBJD arent as hard to care for as some make it out to be. just try to find the healthiest ebjd and just treat it like any normal jd.