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I had a blue linkia for about 3 years with no problem, then it just died suddenly. I did not do anything more than feed the fish and he seemed to get plenty of food from the bottom.
I have had a blue for about 5 months(not too long). YES, they are extremely delicate-more so than SPS corals and anemones IME. I had a slight ca issue that I corrected a few days after adding the star, and the next day the star had gaping wounds on two of the legs. I was sure it was a goner, but it has actually healed itself completely. Watch ca/alk, SG, and ph swings, it doesn't take much IME. The hardest part is finding one that doesn't have issues even before you buy it, look at them VERY closley before purchasing. They are beautiful...HTH