Dubias are great but get ready to spend a lot of money on them...I would get one bin for feeding and one for breeding start off with 1,000 size unknown until you the size of your dragon...And at least 60 female and 20 males adults...Mine is almost 5 months old and eats 30-40 a day 7/8 "
If you start breeding them it will take about 2-4 months before you can start feeding them off....There are a lot of factors like heat, water and the food all dictates how fast they breed and grow...I can't even count how many babies I have ATM but I'd say around 200-300 and more still coming, So be ready to spend around $300 and you should be good to go...