I've got a 12" ornate with some small-ish clowns. It didn't work when I first got him because he took a while to start eating, and would have a go at the loaches when the lights were out so I seperated them. I recently added them to his tank again, he's grown about 2" (and a lot fatter) since I got him but he also happily eats beefheart and shrimp. I guess if he's not starving he'd rather eat a piece of heart than chase down a CL with sharp spines!