Awesome fish. I'm jealous. Apistos seem to come in two flavors. The species that spend all their time front and center, and those that are very skitish and shy. The shy ones will start to come around a little as they get settled in, but sudden movements will still send them running for cover. What's the setup? Tank size? Amount of aquascaping? Tankmates?
Dither fish will help if you don't have many. More places to hide might be in order as well (the more hidey holes a cichlid has, the less they use them).