He jumps up there all the time so I just wanted to be sure
Depends on the lid, its construction, and how well it fits on the rim of your tank!
It's real nice and sturdy, stays on great, it fits on there exactly cause they weren't purchased separately, they came in a kit. I'm 99.9999999% sure it's fine but I just want to be sure.
I think it would take one time it didn't hold his weight to stop that behavior
Yeah, if you're at all concerned, you could put double-sided sticky tape up there or tinfoil or something that would startle your kitty when he touches it.
Separate names with a comma.