There are very few fish I would discourage anyone from trying, but the ribbon eel would definitly be one. Very hard to get to eat. If you are luck enough to get one that has taken to aqaurium fare, sustaining them for a reasonable length of time to consider it a success is still an even bigger challenge.
I see the appeal with their color and delicate looking nature, but man are they a hard animal to keep. I would place them beyond a Moorish Idol in level of difficulty. Just saying.
where's me money