Harlequin.
Yes you can breed a Rex and a Harlequin but the babies would me a mixed breed. They wouldn't be reconized by the ARBA therefore they will not be showable.
There are some wrasses and triggerfish that eat harlequin shrimp. If you have a wrasse or a trigger fish I would notget a harlequin shrimp.I have a cinamon clownfish that attacked my female harlequin shrimp and it died...I also have a Niger triggerfish and a wrasse(don't know what kind) that ate many of my cleaner shrimp and harlequin shrimpIf you have any questions email me at ctnicklas@comcast.net(My cinamon clown is for sale)
Harlequin F.C. was created in 1866.
Harlequin Enterprises was created in 1949.
Harlequin Valentine was created in 2001.
Requiem for a Harlequin was created in 1970.
Harlequin beetle was created in 1758.
Harlequin Melodies was created in 1968.
Harlequin Duck was created in 1758.
Harlequin League was created in 2007.
Harlequin Air was created in 1997.