Those are one of the main reasons I've been itching to go to the dark side...
Never heard about them being difficult to care for though?
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They need large established systems with large pod populations and no competitors for the pods because they are slow eaters. They can be difficult to get eating prepared foods and will go off of prepared foods for no reason at all. They also need to pretty much constantly eat so you have to have a lot of life in your rock to sustain them.