Clarol Silver Serum and Clarol Sebopure both have moisturising actions so you probably should not need a moisturiser over the top as generally people with acne often have quote oily skin.
However some people can experience both dry skin and acne, especially with more mature skin and if you do feel like your skin is dry, then add a night moisturising product over the other Clarol products over night.
Please note that whatever product you use you need to make sure it contains no;
Clarol products contain none of these things and skin that is prone to break outs is likely to have become quite intolerant to many of the chemicals, perfumes and anti-bacterial agents put into many normal skin care products.
If you need more moisture at night we recommend a simple natural light facial oil such as squaline or rose hip. Make sure its a pure oil and not a blend.
Layer this over the top of the other Clarol products at night but ONLY if you feel you need extra moisture. If not then just use the Clarol products twice daily.