I Apologies for any grammar or spelling errors before hand.
I have had lots of success with these little moon crabs or soap dish crabs or Tai devil crab . They have so many common names lol
Since there is like NO information on them if some one else says different I am sure they are, but this has been my experience with them. I have kept many species of crab before and these guys take allot to set up right.
First thing I can recommend for these cute little guys is GLOVES and thick pair or leather gloves these guys pinch and will hang for 20 mins before they let go.
I would start 1 crab in a 10 gallon. 2-8 crabs in a 20 gallons the more crabs you have the better they seem to do. They are territorial and will fight but I have had no loss limbs or claws. Most of there displays is bluffing which they seem to enjoy doing.
The substrate that I used was "bed a beast" it is that really soft compressed coconut mulch that expands when placed in hot water. Kept there substrate moist.
try to avoid gravel and rocks as it really breaks up the little crabs feet. They come from very soft sanded beaches.
Filtered water only!!! They can't take any chemicals in the water. water will have to be changed regularly, ever other day.
Lighting UVB bulbs 40Wnight and 40W day lights. They are nocturnal so I could view them easier I would turn the day bulbs on at night and the night bulbs on during the day that way we were up at the same time.
They have excellent eye site and can see you from across the room, they are very shy the 1st month you have them you will almost never see them. But after a while they will get used to you. Once they realize you are the one bringing the food. They also have an excellent sense of smell mine would always come out from where ever they were hiding when I was cooking dinner.
And as for water bowls, I found the best success with using plastic Tupperware: the long rectangular ones with the short sides. I would dig a spot to put the Tupperware into and put cork bark ramp so the could get in and out of the water easier. A Tupperware size I use is 8inch long 4 inches wide 3inches tall. Fill the Tupperware will just enough water for them to submerse them selves.
They love to chew up plants so provide them with veggies "the frozen corn peas and carrot" are good. Also it is awesome to watch them tear up a piece of celery. For protein they like the hermit crab food ONLY when soften with water. Also grass yup grass they will tear up grass for ever. I feed mine pasta as a treat every once and a while. “Crabs will eat anything”
When I got my 1st crab they said that they only live for 2 year tops Most of them will die in captivity after about 7 months. My little colony however lived for 3 years , and who know how old they were when I got them. But they sure are a really fun crab But YES they take allot of work and most people that sell them say they don't which is so sad. So little is written about them.