I kept a pair before, very interesting to see them swimming around and hunt for foods. Best is to keep in a species tank and relatively easy to keep in my own opinion. I feed with freshwater ghost shrimp and live mysis. When you see them feed, you will understand why it can't be train to eat pallets.
However their life span is relatively short unless you can breed them like jelly fish. Coral farm used to bring them in and marine life once in a while.