I always read these threads and realize how lucky I am. I have a 29 gallon with no sump or anything and my mandarin eats almost everything I put in there except flake and seaweed. I still see a pod now and then but they were long ago eaten. He eats brine, plankton, krill, emerald diet, cyclops......on and on. Idk how I was so lucky but he is nice and fat and will eat right from my hand. I also use garlic, vitamins, and mix it all with coral food into a soup of sorts. Maybe that is why he is fat and happy. Good nutrition? I have had him for about 5 months now.