acclimating coral

Hello, I recently got 4 corals (GSP, Xenia, Zoa, and Micromussa) in the mail (shipped out yesterday). They were already warm, but we put the bag in the tank to match temps. Afterwards we dipped them then glued them into the tank. The Zoa opened up after 30 mins and the Micromussa looks fine...

Wondering proper way to acclimate Indonesian Coral directly from Indonesia they have different climate and was told there temps are 68 degrees Fahrenheit, which would be 20°C