yuma ricordia

Hi I've just added my first few soft corals and my yuma mushroom seems to have an injury or decaying patch after 1 week of being in the tank. Lightly blew with turkey baster and 1 large polip fell off I've treated the yuma with an iodine dip when I recieved from the lfs and again today which...

I have been fragging my yuma and all this time is fine just now, my yuma has black spot spawning on the edge of polyp and it excretes transparent blob I siphon the blob out but the next day it excrete it again I have 2 yumas a days ago that did (Black Spot and The Blob) that as well and it dies...