Hi I am new to the forums Im hoping I posted in the correct spot but i really need some help. I have a rock full of what I think are Yumas and there were originally 13 on the rock and now I have something like 7. They have slowly been being killed off by like a red mucus slime like material. It has been making its way from one yuma to the next. I tried cutting off a whole yuma that was infected and cleaning the rock with a toothbrush and some of the tank water but it was no use. The yumas are still dying. I hope this picture helps. Thanks any help is appreciated.