Ritteri is a common name used for the
Heteractis magnifica
You can search that name but I think yuors is one. Just as said, very bleached. Means its lost alot of the zooxanthellae that depends on good lighting.
Their column should be a very 'bright' color, either red, purple, green ect.
The tips should be like tiny bubbles, not like a BTA though.
Heres some healthy ones. HTH