If the width is fine and he got it down no problem then he's probably fine, just give him time to digest wait at least 7 days between feedings. I got my female pin in a 16qt she's 500 grams around 2 ft and eating weaned rats 30-44 grams each, and she could probably take small rats, but weaned are cheaper and are a good solid meal for her. She'll get small rats when I buy more feeders (i buy in bulk every 3 months) Also I plan on upgrading her too a 32 or 28 qt tub in December when I build another rack that will hold 4 or 5 32 or 28 qt tubs and 6 16 qt tubs. This is just what I'm doing based on my limited experience hope this helps good luck.