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Are you asking about child support or about the rent? You cannot asked two questions on this post.
Did you make a written request for the landlord to address the mold?
The landlord owed you a duty to keep the home in good repair. That included ensuring that there was no mold in the home.
If you made that request in writing then the landlord is in breach of the act and his duties.
For this reason, if the landlord were to sue you for more rent you can say that the reason why you were not required to provide that notice is that the landlord breached the tenancy agreement by not removing the mold. Your case is actually quite strong.