A ram, but either a weird colour morph or stressed out.
it is a cichlid but im not sure it could be stressed again but if you give out more info maybe someone will be able to help.
Info like ph other fish size of tank.
Its one of the paler morphs of Microgeophagus ramirezi and they are very sensitive to water conditions.
They also prefer lower pH & really need mature tanks.
I wouldn't put one in a newish tank with tiger barbs (btw you need more tiger barbs to make a decent group)