Mealworms Acting Strange

[stellascura420]

I checked on my mealworms today and a lot of them were rolling around and thrashing about. Is that bad?? I've never seen them do this before.

 

[Western Gecko]

Too much coffee grinds in their substrate... :main_no:

Seriously, have you added anything new to the substrate or changed their source of moisture?

 

[stellascura420]

No just wheat bran and oatmeal for bedding/food and romaine stalks for water until I can get some carrots. It's been pretty cool in the room they're in lately so I just put a space heater in there today to warm it up a bit. Could that be it?