My vampire crab died just now. I went to check on the tank and feed them, so I liftedup the decoration they hide under to feed them and the vampire crab and red devil crab fell out. As the red devil ran away the vampire crab was layng there light in color, first thought was it must be a molt, but then I noticed little black pebbles/maybe eggs fell out of it abdoman area. I have no idea what they are or what killed it but I'm getting worried because they are dying like crazy in my tank and the water is in good quality can some one please help and explain what is gooing on?