good question...you know, i am not sure if they need a vertical burrow vs. a diagonal burrow. maybe Dr. Roy has some more info on that? i would be very interested to find out.
when i first got them and set them up, i put the clear plastic tubing in there for burrows for them. it is hard to tell from the pics, but the sand layer is about 8" deep at the deepest point. so they do have the opportunity to burrow vertically if they need to. but when i introduced them to the tank, they went right into the plastic burrows and have not left. so either they don't mind the diagonal burrows, or are just too lazy to build another burrow..
i have had the pair a few months, and they have been doing great...eating and lurking and all that other cool mantis stuff. a few weeks ago, the female completed a perfect molt. the male is about 5", and the female is now 6". the tank i have them in is the 33 gal. Oceanic cube, which is over 20" tall. so i could provide a sand layer of over twice the length of the shrimp, if that would make them happier...however, i would like to continue to use the clear plastic tubing so i can watch them. i usually keep a sheet of black aquarium backing taped up over the female's burrow, so she has darkness most of the time. then, it is easy to remove the plastic if i want to check on her or take pics.
they are a definite male/female pair, but i have not seen much interaction between the two. when i introduced them, they looked at each other for a couple minutes, then went back into their burrows. i was kind of hoping that they would pair up, as it would be interesting to watch their behavior. i don't know why they have not paired up--maybe they are too young, or not compatible for some reason? i guess that would be another question for Dr. Roy...there is just not much info out on this species and not many people keep them, so i would appreciate any extra info or help
