Hmm, weird. I would suspect maybe the lighting isn't to their liking some way. I have several of that same clone under T-5s now and they look great. I think you and your anemones will love the T-5s. I have a mix of 10,000K and 6,000K, but you can get by with more blue than I have and be just fine. I'm glad to hear they are eating. They are pigs. Have you checked the temperature with another thermometer. I'm just trying to think what could lead to them bleaching. If the water temp is too high, that could do it. I'm sure you do regular water changes, but that could also be helpful, to do partial water changes to make sure the iodine, etc. is present for the zooxanthellae. My first guess would be that the MH lighting isn't doing the trick for some reason.