Yes, and No. Best to hire a #houstonfamilylawlawyer to best present your facts. Review of child support can happen about every 3 years.
Low income alone would not likely be a reason to lose custody. Some circumstances relating to why the income is low, if they create other concerns, might.
Not if custodial parent is a good, responsible parent and child is thriving in school and is happy.
All commentary is for informational purposes only and should not be construed as legal advice. Consult an attorney for legal advice.