And you don't have to wait until night. If you feed directly, softened food right on the mouth area, and protect it from robbers then it will feed anytime. You might want/need to suspend the circulation while doing so. They seem to be able to digest the pellets ... some speculate it's because they're already processed. Soak the pellets in tank water first to soften them.
I urge you to look at that thread link provided above. That is a "rescue" thread and it's amazing how some of these bounce back.