Honestly, they're quite capable killers. I try to feed what I feel is a proportionately accurate meal but I've misjudged it occasionally. For my more aggressive Ts I'm not as strict about proportions but the bigger you feed the more likely they'll plump up and go into a long PreMolt. I think the worst I did was misjudge a the size of a cricket and threw it in with my OBT sling, the cricket didn't last long. My OBT actually ruined his burrow by dragging the cricket inside and it actually pushed the walls out as the cricket didn't fit inside the burrow well at all, lol. That meal was only his second since last molt and it sent him right into PreMolt again.