When you first showed your Micropeltes, he was alone in a tank too bright for him. What happened to that tank? If it's still around, put it back there, dim the lights and adds plant covers. Don't put any tank mate.
He will be fine as long as he's not with fish that can (and do since his fins get nipped) bother him. In the case of a Micropeltes, that's no fish at all.