finicky severum

Hi... I'm getting desperate.

I have owned my Green Severum for about 4 years now, and while he's
always been a picky eater, lately he's just gotten worse.

I have a virtual graveyard of foods I've tried and he's rejected. The
only thing he'll eat right now is HBH Super Soft frozen food alternative
with krill for marine & freshwater fish. He'll eat that - sometimes.
One pellet will be fine, the next he'll spit out, then he'll eat another
one fine.

And that of course is when he SEES the pellet. He's either blind,
retarded, or both. He really only sees well on one side of his head, so
I have to drop the pellets, one by one, to places I think he'll see.

One of my fish-keeping friends keeps telling me if a fish gets hungry
enough, he'll eat. But that just seems cruel to me.

So, any help/suggestions/advice/recommendations?

Thanks!