Well, thank you all for the input, unfortunately nothing helped. I ended up cutting off half of one arm and the tip of another that was starting to do the same thing. Boy these guys are tough, it took a lot of force to severe the arms.Anyway he just kept rotting away. When the one arm got all the way to the disk and then kept going I threw him away. All other fish and inverts seem to be happy and no degredation of water quality. I thought I acclimated correctly but maybe that was the problem.