If you remove all the fish from the display, I thought you are supposed to leave the display tank fishless for 6-8 weeks (for the ich cycle to complete).
Just buy the Nori/Dried Seaweed thats sold at your LFS, take a small piece or two (the amount you think your tangs can eat), apply a few drops of Garlic Xtreme (another product you can buy at your LFS), I also add about 0.5mL of Selcon, allow the Dried Seaweed to dry, and simply use an algae clip to feed your fish. As for length of time, I leave my clip in the tank until the Nori has been eaten, which usually isnt too long. Not sure about the parsley, but I've heard of them eating broccoli.
Hopefully that helps
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