American Flag Fish - help

Hello :

I had a wicked case of beard algae and I tried everything to get rid of it.
Finally, I had my LFS order me 4 American flag fish. In the last 4 weeks
they've completely eliminated the problem. The trouble is now they have
nothing left to eat. They don't seem to eat the flake food I feed the rest
of my community fish, or the pellets. They're beginning to look very skinny
and unhealthy. I lost one recently and now I suspect it starved to death.
Anyone have any ideas to save these little guys ?

Shawn