Repticzone can be good sometimes, they need help and I try to give it.
That was a nice looking tiretrack.
I feed mine (as with all my fish) nothing but New Life Spectrum. He eats it out of the bowl. I use an UGF tube with a funnel on the top to put the food right in a reptile feeding bowl (from ExoTerra). As soon as the food comes in he is over at the bowl eating. He actually sucks it up out of the tube before I even get a chance to let it all get to the bottom of the tube. Somehow I have not gotten any good pics of him in action, mainly because he sits behind it and sticks his head in really quickly to grab a mouthful, pulls back, swallows, then grabs more.
He is in the 150 with 5 discus, 6 silver dollars, three bichirs (albino, delhezi, ornate, all 4-5"), 4 bristlenose plecos, a gold nugget, and 2 Synodontis eupterus. They all get along really well. He minds his own business in his rock pile. Sometimes a pleco or bichir is in there too, but he doesn't seem to mind. When he was in the 75 he did give some eels some trouble. And yes, the discus are fine. The silver dollars don't bother them, they are doing quite well in there.