I've always heard inverts and corals are more sensitive than fish to acclimation, so you're supposed to do it slower. For the polyps I got, I floated the bag for about an hour and a half, and ever 15 minutes I would go and take a bit of the bag water out and toss it... and a bit of my tank water in. Other people have recommended the drip method in which you put the bag in a bucket and start a siphon from your tank... then tie off the hose so you're getting a slow drip into the bag with your corals or other inverts.
Personally I got a wee bit worried the first night I put mine in. At the store, the vast majority on the crown were open and looked good. After I put it in my tank, even after acclimating it slowly.... some of the polyps looked bleached and wouldn't open. This was taken the night I did it, last Wednesday.
But over the weekend more and more have opened up, some of the ones that were white have regained their color and started to open, and at Navarre's suggestion in the other thread... I even got them to close up on a few pieces of zooplankton! Now they look more full than they did in the shop! This picture is from Monday night.
I'm not sure what's up with the white balance on my camera. I assure you in person they look more purple, not brown like in those pics. I think the flash is throwing the colors off, even on every white balance setting on my camera. I'll try to take some more pics later without flash... maybe of them eating.
Oh, and as for tank setup on mine.... it's in a 20g long with a 65w Current-USA Satellite power compact lighting rig... 50/50 10,000K daylight/Actinic 03. Water temp is a steady 81.