I dont know if he has a pump for his food or if you are doing it gravitationally (is that a word)I was able to get a big bag for the food and set the pump to put it in at a certain rate per hour. Then all he had to do was add a can of food at around lunch time. It will begin to get better soon, he is still dealing with the radiation "poisoning" that happens. You should start seeing some improvements within the next week or so.
Im so sorry you are going through this, hang on the ride should get smoother.