My Leos have never been impressed by Mealies - or anything wormlike, in fact.
The main concern I have with the OP's information is the 'Cube' viv. Is there sufficent space there to generate a temperature gradient. The Gecko does need to thermoregulate by adjusting its position between its surrounding's warm and cool areas. Will the cube allow this?
1.0.0 Bearded Dragon/Killing Machine : Roddy
1.0.0 Crested Gecko : Merlin
0.1.0 Gargoyle Gecko : Amber
1.0.0 Yemen Chamelion : Bruno
0.1.0 Shrieking Cockatiel : Chip