Yes, I've had one for 11 months now and it's a picture of health. When I first got it ( a juvenile about 4 1/2 inches long) it refused to eat any of the foods I offered for over a week. I could see that it was definately hungry as it was constantly pecking at rocks and the glass where little pockets of algae grew. I could see that it was interested in eating but the problem appeared to be getting it to eat from the water column. Heres what I did:
I usually feed my fish a mixture of frozen foods in the morning, then flake or nori or sea vegies in the evening. I noticed that the Idol was showing some interest in pecking at the frozen bloodworms that happened to land on the sand or rocks. Trouble was it was only "mouthing" the bloodworms and spitting them out. I thought I'd try feeding just the bloodworms, putting 2 cubes in the tank so that they were everywhere. The other fish went crazy as usual then lo and behold the Idol started to join in, but now it was swallowing the bloodworms and taking them from wherever it
saw them, sand and rocks and from the water column.
Next day, I fed just bloodworms again. All the fish, including the Idol joined in.
Next day, I fed the frozen mixture but no bloodworms this time.....just brine shrimp, mysis shrimp. marine-green mix and the Idol started "mouthing" the new foods, but soon was swallowing them.
For the next week I continued the normal feeding regime and by weeks end the Idol was eating everything and quite greedily. Soon after it was eating flake, nori, sea vegies and now is the first to start and last to leave the table. In fact it takes Nori from my fingers. It has grown 1 1/2 inches in the 11 months I've had it.
A couple of things come to mind; I think the red colour of the bloodworms may have been an attractant as I know that Idols favour sponges in their natural diet. They are definately a grazing type feeder...you will often see the Idol blowing water at the surface of the sand trying to uncover things just below the surface. The trick is to get them to eat from the water column, once you've cleared that hurdle they are as hardy as any other fish.
The other neat thing is the "night" pyjamas they put on, where the white parts become a creamy colour. Mine is the only fish in the tank which actually sleeps in open water...all the others hide in the rockwork.
Hope this helps.