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A colony of Dubias would be far too much for four Leopard Geckos. Dubias are rather fattening, and if fed as a staple can lead to obesity and liver problems for a gecko.

Crickets are usually considered to be the staple of a Leopard Gecko (good nutritional content, easy to purchase, and easy to care for), with mealworms, superworms, pheonix worms, and wax worms being treats (keep in mind that pheonix worms and wax worms are fatty, and mealworms are mostly chitin which is hard to digest). You can also keep a colony of crickets to breed, which shouldn't be that hard. Once you get used to the chirping (trust me, eventually you do) that is. :P

I hope this helps!

Do NOT do this, just like wax worms, dubias are very fattening for leos and if you feed them these on a regular day basis, they can get obese and die. I would stick to the mealies and crickets and if you want, you could give them a dubia once a month, no more than once.

this will always be disputed as most things are with reptiles me personaly id say they are like treats but have u thought of doing a colony of lochasts and dubies will save u a fotune in food