One of my silver dollars died today, im not sure if its from old age or weather it had a problem. No signs of damage so I dont think a ray or the aro got it maybe it was just old age judging by its size.
Sorry for your loss...I wonder what the est lifespan is of a SD in captivity? I have shoal of SD's and RHk's in my 150 , smallest one is about 4"...At the Shedd in chicago I was amazed at the size of their RHK's...