"red" Vampire Crabs invade America

[Swords]

Hello folks,

I am from the USA so please excuse my use of English but there are no really experienced Geosesarma crab websites in English so I have found this group forum. I read this site translated by Google and sometimes things don't make lots of sense from bad translations so I thought I would make my own post here since it is known that you Europeans have been keeping these crabs much longer than Americans maybe can help me to get started right keeping and breeding them.

Firstly I will introduce my setup and a few crab pictures then ask some questions:

I have 4 male and 6 female Geosesarma sp. "Red Vampire Crab" which I received by mail on last Wednesday June 23rd. I had 5 male but one died after 12 hours of arrival.

Vivarium is 36"L x 18" W x 18" H with T5 High Output lighting. Between 70-85*F all times. Setup like a lowland SE Asian peat swamp with peat & spahgnum moss soil, living sphagnum moss and other moss types. 3 forms of Nepenthes ampullaria pitcher plants and other plants. I add new plants whenever I find interesting small species.





I read that these crabs are communal and enjoy others of their kind but they grapple sometimes. Not so much now they all have their own burrow to hide.


This crab died almost right after I took this picture, is camera in face too much stress?


Some have all red backs some have red with yellow border on bottom of red pattern, are they the same species?


Now some first questions:

1) I use R/O water which rate between Ph 7.0 & 8.0 depending where I buy it. Is this OK? Should I use natural spring water from a creek instead? Maybe higher Ph but more minerals?

2) Is it OK to use distilled/RO water to mist the vivarium several times a day?

3) I add 1 drop per 5 gallons of Kent Marine Iodine in soaking pool water for better molting, is there something I need to add for calcium? My crabs rarely spend time underwater, mostly in burrows I've dug or under moss. How else to supplement their calcium? Cuttlefish bone for birds?

4) I feed with live fruit flies, small crickets, Isopods (Porcellio scaber) and Giant Springtails. Isopods eat cuttlefish bone and fresh vegetables so are already full of calcium. I dust the fruit flies and crickets with reptocal calcium + D3. My Anole lizard only gets calcium supplements every other day to avoid toxic buildup. Can crabs eat too much calcium? Should I feed the crabs live food and calcium dust every day? I also sprinkle flake fish food here and there for them to find. Are these good foods I am giving them or should I feed something else?

4) Does anyone have pictures of Geosesarma crabs mating or having mating displays they can post? How long for egg development, gestation? What do baby crabs eat Isopods and Springtails soil organisms maybe?

Thank you for any help you can give this poor American who wants to keep his amazing (and very expensive) crabs alive as best I can!