at my school we just had soil for them and when we changed it we had to look to see if there was ever any 'Babies' I left school before it happened though :( But my teacher loved all his animals so Im sure that is perfectly fine to just use what you got. Good Luck
Ok, Take a plastic box, big enough for the geckos to stretch out in, this will be a good nest box. Cut a hole, about as big as a silver dollar. Carefully burn the edges, this will prevent the L.G. from getting hurt. The best thing you could use is perilite for the sybstrate. Use Three part water to one part perilite. EX. If you use a cup of water, use 1/3 cup water. Check the substrate every so often to make sure it is a little wet. If the eggs start to dent, add water. Pour a LITTLE water AROUND the eggs. Be careful, if you put too much water, you will drown the eggs. Keep the eggs between 75-79 degrees F. The temp. of the eggs will determine the sex of the babies. The higher the temp. the eggs will be male, lower temp will be female. The eggs will hatch in about 60 days; the higher the temp, the shorter the incubation period. Good Luck!!!!
Cocoa fiber, perlite, vermiculite and organic potting soil all make good laybox substrates. Check them at least once daily when you notice the females digging around in there.