The biggest question is if the fish is being shipped or not? That changes your approach all together IMO... Your biggest advantage will be testing the PH of the water the fish comes in the bag with and your tank. The closer the perams, the sooner you will be able to introduce the fish to the aquarium, the farther the PH gap is, the longer you should drip.
Hoplarchus Psittacus is a beautiful SA cichlid and and very cool fish BTW,
you have nice taste.