I have started to get Sunny and Lily into the habit of eating in a feeding container/tank. However, they seem to attempt swimming into the walls of the container, as if trying to go to the other side. They refuse to eat much food, although a great variety was offered. They even rejected ham (a rare treat!) , something they would never do.
They seem to poop before eating, even though it may be the first meal of the day. How do I entice them to eat in the container?

