acclimatize coral?

[Douglas]

Do most people acclimatize coral? I bought a couple of full colonies of sps coral, the other day, and didn't acclimatize them, like i would fish or inverts. Within 2 days, they have signs of death. I have several established frags of sps, that are now small colonies, and are thriving but were never acclimatized. My tank has been running for a couple of years, and it's fairly stable. Just wondering what might of went wrong, and want to know if acclimatizing them might have helped. Thanks

kh 8
mg 1300
cal 380
sal 1.025
temp 78 - 82