IME, the real killer of these guys are change in salinity. I would use a drip hose to drip him to our tank. Salinty of change from 30 (most LFS) to 35 ppt (my tank) need about 4 hrs. I use some air tupe hook to hard air tupe bended to U shape, and add a air valve to adjust the flow rate of water. i use this to drip water into the container with the star in it. This is much better than add cups of water every 10 or 15 minutes.
IME, pick up the star with my clean hand cause no problem. Here is my 4 arms Red/Orange Linkia. I hope he will reproduce asexually byt droping another arem in the near future. The missing arem grew 1 cm last month.



Minh