I have a similar situation in one of my tanks, where my tire track eel does not get enough food due to faster swimming tankmates. I use a BBQ skewer and place cut-up tilapia, krill, silversides and nightcrawlers on. I target feed by placing the morsel of food directly in front of the fish. I also use this method with my slow-swimming gar that are housed with fast-swimming tinfoil barbs.