Wow, 70 Ricordea! You bioload for the tank is probably at its max, and the sailfin might want more room in the future. I wouldn't discount the possibility of allelopathy here. That's a lot of soft coral in a small space. Wait a few days and see if it perks back up. I may just be shedding. If not you can always increase the amount of carbon filtration you do. ViaAqua makes a PolyReactor which you can place carbon in. It comes with a pump and all the plumbing you need. However, this would only treat the problem if it's allelopathy, not cure it. You'd either have to remove some of the softies or continually use and maintain the reactor. Hope this helps. BTW, PolyReactors are fairly inexpensive and can be had for ~$40. Most online retailers or LFS either have them or can get them for you.