Yumas Releasing
 

I got an orange Yuma 1 1/2 years ago that has since developed into a nice colony of a dozen or more yumas in various stages of growth. In the last week or so they have started to release from the rock they are on and shrink up. I haven’t changed a thing in my maintenance routine or feeding. I’ve been putting the very small ones in a mushroom box and some seem to be getting smaller. What is happening to my beautiful colony all of a sudden???

Check your water parameters. Magnesium, etc.