Should I ask for more child support?

*Before people bitch about child support I’m not here for that it’s just a general question*

I co-parent with an extreme narcissist, my husband has my ex and I’s child on his health insurance. Should I ask my ex to help cover some of our child’s medical bills. I understand he’s gonna flip out on me and go off. But does that seem reasonable?
Should I ask for more child support?
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