Khat,
This would be an excellent time for you to buy a quarantine tank. Look at it this way - If you buy the quarantine tank, you can buy those fish sooner. Just don't add them to the main tank for about a month, as you seem to have had a pretty bad ich outbreak. But the Q tank... let it sit for a week... but a fish or two... let them sit in the Q-Tank for ~ 3 weeks... presto, you can add them to your main tank. Qaurantine tanks don't have to be a drag.
Also, you really need to test your Nitrates. I suspect that they're high and this might have been a contibuting factor to the inability of your fish to fight the parasite. Also, you may want to cut back on the feeding of your anemones just a bit. I have a huge Sebae that I feed ~ one a month... if that. It gets food from my clowns and from the Photosynthesis of it's internal algae. So far, I've had it for 2+ years and it's about 4-5x the size it was when I got it.
Also, Powder Blues are notorius for their delicacy and susceptibilty to parasites like cryptocaryn. You might want to wait a while and research them quite a bit, before you attempt to keep one again. If one fish really breaks out with ich and isn't removed, this makes the ich populations so high that the other fish have trouble compatting it.
If this happens again, you can start with the garlic approach, provided you watch your fish closely. I would always have a Q-Tank in reserve just in case. There's a lot of info about ich, garlic, medications, Q-Tanks, etc. in the Disease and Treatment group.
LOL