Seth, this sounds like a classic case of improper acclimation. linkia seastars are one of the most difficult inverts to acclimate, usually require slow drip acclimation over the course of 2-4 hours, or more. failure to properly acclimate will result in what you see now.
This "melting and dumping" will happen within 1-4 weeks of introduction if acclimation not done right.
i personally recommend you not try to keep any more until your tank reaches 10-12 month. this is for 2 reasons. it gives your tank time to mature and be stable, but more importantly it give you time to mature as a hobbyist and gain more experience with these types of things
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