Well, now I know why Ken couldn't fill my order for O. havanensis. He has been supplying my research needs for years.
O. havanensis is not your typical mantis shrimp. A few words of warning. First, they jump. An adult can clear 6 inches and I have had more than one end up on the floor.
Also, they are one of the more delicate species I have worked with. If tank parameters go off, they will be the first to die. Low oxygen is particularly a problem.
As a burrower, they don't live as long as most gonodactylids. Maximum that you can expect is 3 years.
These animals are burrowers that live on open sand bottoms. If you provide them with about 2 inches of sand gravel and lots of bits and pieces of shell, coralline algae and coral in the 1/2" range, they will eventually pile it into a mound with the burrow running under it. This is what they do in the field.
Also, they are a deeper species, 10-50 m. They do not do well with bright lighting.
Roy