Help, need advice setting up Vampire crab tank/keeping Vampire crabs

[Forerunner546]

Hello, as the title suggests I need advice on making the best possible life for purple Vampire crabs. (Geosesarma dennerle)

Right now I am attempting to set up an aqaurium for them, however there is very little information I can find about these crabs.
So far my idea is to have a 50/50 split between water and land. With a drainage layer and soil layer, as well as covering to split layers. Under the water side I will put sand.

I have a repto-filter, which unfortunately has a high minimum water level. So I have set up a barrier of rock to stop the tanks soil from sliding into the water. A picture is attached.


(The water line must reach to the uppermost rock)

Any advice on my tank setup and knowledge on the requirements for these crabs would be welcome.

 

[OrionGirl]

I know very little about them, but I have seen someone who has a paladarium setup for them, with carnivorous plants. That means they'll like high humidity and warmth. One option is to use a plastic box for the soil, with gravel or a rock layer to create a 'beach' between the water and land areas.