My vendor says there is a specific bacteria disease that affects only trachys in a reef tank.Mine did exactly the same thing.
All of them. After 6-8 months. Just shriveled and died.
Everyone else happy, just the Tracs, 4 of them.
wondering if they are not good with captivity.
Also, long tentacle plates and elegance. For me, 6 months best.
Hum?