Looking for peaceful crabs

heyhi

I have a 55 gal with

2 shrimp
3 black tailed tetras
3 red tailed tetras
6 neon tetras
1 florecent
3 panda corys
3 kuhli loaches
2 upside down cat fish
1 semaprochilodus theraponura

and im gonna get few frogs and maybe a apple snail

I wanna put some crabs that wont bother anyone

my upside cats, kuhli loaches are always in hiding ,
the corys are always hanging at the bottom

Psychmajor

Mini crabs, also known as fiddler crabs, are pretty good. I have four,and they dont bother anyone...