I had 2 sand sifters for about 7 months. The tank is about 12 months old now. So, 3-4 months ago, the smaller of the two lost a leg. Then another. The shrimp and crabs took care of the rest of'm. Two months later, the second one started down the same path and died too. I did notice that when they came up, the sand seemed to stick to their bodies. That was different. I've got a 2 1/2" sand bed.
Anyway, it was suggested in threads at the time that they may have starved.
So... a week ago, I thought I'd try another. 2 days afterwards, one leg was gone. The hermits finished him off too.
I've had zero nitrates for months now. The only thing out of whack right now is my phosphates, which have come down to .6 since I added a bag of Rowa-phos. And yes, I use only RO
water. Too much food, showing off over the holidays most likely
All coral and fish are doing well, but i recently lost a trumpet and a leather, I suspect because they were new and didn't like the phosphate. All existing/older coral are doing excellent.
What is happening to my stars??