The use of colour for any element of a ui depends mostly upon how you want that element to be used/stand out to the user.
Obviously colour has an aesthetic appeal to the overall design and you do want to keep the colours inline with an overall vision, but in your particular case I think the question I would try to ask myself is 'how important is this information and how eye catching do I want it to be?'
Contrast/pop-out colours will be required if this information is very important and you want the user's eyes to be drawn to the information immediately. This pop-out effect can be done by using different saturations of colours, or finding a contrasting colour to the one used for your background. The 'severity' of this contrast can help adjust the translated 'importance' of this information to the user. For example bright yellow is very eye catching and the user would probably look immediately at the information. If a more saturated yellow was used, the yellow would still have a pop-out effect but it wouldn't be as severe as the bright yellow.
If you want the information to carry certain meanings than there are some colours that are pretty engrained in users' minds to indicate whether a piece of information is bad/invalid (red), good/valid (green), or if it indicates caution or a warning (yellow).
Without seeing the colours used in other places for your app, it is hard to make a recommendation that would fit nicely with your overall design but something you can do is perhaps look for resources that discuss effective colour use in ui design. You probably won't find any specific resources that discuss your particular scrolling information element.