i would set a routine ,
i turn on the tank light in the morning , this tells the dats i am going to drop some food in as i have always done this after a light switch on ,
so when that light gets on they all start a bit of pushing and now its gonna be a game of snatch between themselves , i can drop anything in there now in the morning and they wrestle for it even the catfish pellets, in the eve i vac the gravel and do some maintenance then drop a frozen bloodworm or krill in to take their mind off the fact that i have had my hand in the tank for a while , later on about 8pm i go back and turn off the light ,
i think routine is good for fish as they know your there to feed at a certain time