Vampire crabs

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Athocking

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Hello, I've recently set up a small vampire crab tank. I bought 2 vampire crabs and all seemed well for around 3 weeks. I assumed I had a male and female because one was half the size of the other. All of a sudden the biggest one disappeared and havnt seen it for around 3 weeks. Then the smaller one vanished around 1 1/2 weeks ago. I found the smaller one a few days ago hiding, sluggish and lacking colour.
I left the crab alone and in the morning had gone again.
Ive been trying to find out what is normal moltinhg behaviour but can't seem to find much information.
Can anyone help me ? Have I lost my crabs ?
Cheers in advance
 
test the water for ammonia, nitrite, nitrate and pH.

do a 75% water change and gravel clean the substrate every day for a week.
make sure any new water is free of chlorine/ chloramine before it's added to the tank
 

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