 Re: Will my rock die???
My experience with brittle stars is.. They will come out only when its dark, only when they sense (smell) food ie, shrimp pellets or meaty foods. When I feed my corals brine shrimp, or frozen food, or whatever, they smell the food and bring their arms out to try and snag it. They will not normally bring their whole body out to search for food during daylight hours unless they are very hungry or they have been taught that that is the only time they are getting food. Then they retreat back under their rock to consume the food.
IMO - Not very many people have luck with the shrimp idea on aiptasia. Buy some Joe's juice if you're real concerned and give it a try. There are NUMEROUS posts and you could probably spend HOURS reading them all. But go ahead anyway and become the resident expert on them. Then you can give other people advice on how to get rid of them. I have 2 they are not multiplying right now and I have had them for 6 months. So let me know how you get rid of yours.
Jim
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90 Gallon glass, 135#'s of rock and 2" sand. 2-250w 20k XM metal halides. 2-95 watt actinic VHO, 4 powerheads, Coralife skimmer. Maroon Gold Striped Clown, Blue Chromis, Kole Tang, Pygmy Angel, Serpent Star, Brittle Star,Gorgonians, Mushrooms, Yellow Polyps, Turbo Snails & Blue Legged Hermits. 20 gal sump with Caulerpa, Mag 7 return pump. | 
