Ricordias only require temp acclimation and then they can go right into your tank, but it probably won't do any harm to drip acclimate. I wouldn't do this though for something that was shipped and not purchased locally. best to get it into the new water right away. Adding new water to the old that it was shipped in is not a good thing.
Really, only fish and inverts need drip acclimation. With corals it is usually recommended to temp acclimate only.