It was force/in between feeding. Placing it in their mouths lead to nothing but them spitting it out 3 times each. So I had to nudge it in enough to get the head down their throat and massage their throat until they stopped trying to remove it and began swallowing. Then I put them back in their tubs (removed them to assist and then force, didn't want that associated with their tubs) and left them alone for a while, they didn't regurgitate it and moved back into their hides (the only instance of me bothering them again was to check for regurgitation).

They have terra cota hides instead of plastic ones, due to their availability (plastic ones I couldn't find locally after checking a few places). And they are the 6" flour base ones. The tape is set to 33c, which is about 88-89 in their tubs. Ambient is about 75 in the room.

Brown paper bag I'll try for their next couple feedings.