First off we need to know how old they r. I'm assuming very young since u feed them so frequently. They may be ready to move to a more spread out schedule with bigger meals. If all the things above check out then just offer f/t and leave it in overnight if u have to. This time of year its pretty normal for them to slow down a bit or not eat at all. And if ur female is young, u won't be breeding next year so don't try putting on the weight fast and risk her health just cuz u want to produce caramel albinos