You can also try slapping some contac paper (clear) on the lid - snip out the corners to make open triangles - I have one prepped for Neph (AfRock) to transition into in a couple weeks as she is growing like a freak and has hands down the most eye-popping feeding response I've seen in a snake - thawed rat within 5 feet of her enclosure and her head is out and cocked - our big BPs 'Suki and Sesha are right close behind.

Yeah I get a bit manic on feeding day