Mine loves the ArctiPods, as well as live pods. I have been getting them from AquaBuys lately. You can keep live brine shrimp for some days in almost anything as long as you aerate them. I have gotten those from Aquarium Showcase in the past... have not gotten any lately. If it is really not eating, you need to get food in it ASAP.
Mine will also now eat frozen Mysis shrimp.
My experience with them eating Aiptasia is that they must be eating them while they are very small, but they don't seem to mess with the larger ones. After I got mine, I did a sweep with Joe's Juce (as I had done many times before) and this time they did not come back...
Good luck!
-Mike