I don't know if you've already seen this (found in google docs) but i've cut and pasted the relevant info for you. Fom a paper by Micheal Cozijin
Keeping in captivity
The latter of the following information is based on my own experience and should be regarded as an
example of how to keep this species in captivity. This species is being kept and bred by hobbyists, but
not on a large scale. In my opinion the minimum size for keeping a pair of adults is around
30x20x20 cm (12x 8x 8 inch). Juveniles can be kept in all kind of deli cups. I keep my
juveniles separate to avoid the risk of cannibalism and I keep adults in pairs. I keep this
species at a temperature of 24-28 Celsius (75-82 F) in the daytime and around 21 C (70 F) or
room temperature at night. Since this species comes from an arid environment, there is no
need for high relative humidity levels. These should be kept at the low end, to prevent
mycoidal infections or mycosis (II), which can be harmful to scorpions, and even kill them
eventually. I lightly mist a corner of the enclosure once a week. When the scorpions are
getting close to a moult, make sure the relative humidity is a bit higher than normal to prevent
moulting problems.
Humus (70%) mixed with sand (30%) is in my opinion ideal as a substrate. This species does
not dig burrows and pieces of cork bark or stones will be accepted as a retreat. Provide a small
bottle cap or film roll cap of water, for drinking. I refresh the water weekly. This species
breeds without difficulty in captivity. Adults should be fed one or two appropriate sized prey
items once a week. I feed my scorpions crickets twice a week until they are passed the third
instar. Prey is killed by a (couple of) quick sting(s), depending on the size of the prey item
and on the size of the scorpion. Juveniles can subdue surprisingly large crickets for their size,
sometimes up to 150% of their own body size. This species can have a somewhat nervous
and/ or defensive disposition. G.grandidieri, like other species of the genus, does not produce
iteroparous litters.
