X2 on the setup needs to be changed. You need at least one more hide and aspen or some other substrate the can burrow in is a must. I am not a fan of tubs like to see my snakes but for those little guys you could put a tub in the tanks untill the get a little more regular with thier feeding. Remember baby snakes are food for biger snakes so security is very very important. I would also cover 3 sides of your aquarium at least until you move to a 20-40 gal at that point you have enuff room to put driftwood and fake plants to offer the security you snake will need. Your big girl is well established and comfortable where she is but the breeder I am sure kept your little ones in tubs. I have had luck after several feedings 3-5 switching to F/T no problem but only after the security/husbandry was taken care of. I hope this helps and love the look of youe littel guys
Robie