what to do with cory fry runt?

[ripit]

I have 10 albino cory fry (not really fry anymore) that are about 5 weeks old. 8 are growing fine (they grew very rapidly for a while). 1 is much smaller but looks like it might get big enough to go in a community tank. One is tiny and doesn't seem to be growing at all (about as big as the others were after a few days). So does anyone have any ideas what to do with the tiny one? The others will go into community tanks soon. The first pic shows the larger of the small ones, next to one of the smaller big ones. The second pic shows the tiny one next to a big one. They are all the same age.