a community of cichlids in a 75 will requite some planning. there are a decent ammount of fish you could choose from, however, you need to ensure the fighting will be minimal since a 85 dosent give a ton of room for nasty fish.
if your looking for a colorful tank, you could mix gold and/or blue rams with geo's, angelfish, or even blood parrots (if your into hybrids), convicts as long as you dont get a breeding pair......these are just a few of the most basic, readily available american cichlids. your options blow up when it comes to africans.