Can I use two different acne treatments together?

Hi guys ! I'm just wondering if it's okay to use two different acne treatments in the same time. So, my new skin care regimen consist of : Cleanser (either Neutrogena Oil-Free Acne Stress Control Power-Clear Scrub OR Spectro) – Toner (Kiss My Face Balancing Act) – Acne Treatment (Acne Stress Control 3-in-1 Hydrating acne treatment).

My first question is:
After cleaning, toning and applying this acne treatment, can I still apply a moisturizer on top of it all ?
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Also, my order of Michelle Phan's iQQu Acne serum is coming soon. So when it does, a few things will change.

My second question is:
I'm wondering, after cleaning then toning. Will I be able to apply Acne Stress Control 3-in-1 Hydrating acne treatment FOLLOWING BY iQQu Acne Serum? Or should I only be using one of theses acne treatments one at a time ?