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Drip acclimation is typically the best route when unsure. Many hardier species of coral do not require the same time frame as would a star or other highly sensitive invertebrate. Depending on the soft corals, you should be able to acclimate these at a slow dribble as apposed to slow drip. Just be sure you refloat the bags for temp compensation before placing them in the tank.
here's what I do for all my new tank mates no matter what...
Float for 30 min... Grab my turkey baster add one full of tank water, wait 15... remove 2 bulbs wirth then add 2 of fresh tank, wait 15, remove 2 more add 2 more... wait another 15 and I pick em up and dump em in the tank...