Hi @NickD! As you can see, the use of Liquid Carbon in the aquarium is a hot topic! That being said, I do use AQ CO-OP Easy Carbon as a spot treatment for stubborn algae. I feel like it gives me a good assist when I'm trying to balance a tank that simply will not balance. So in answer to your question, I think you are safe not to dose Liquid Carbon until you see you have an algae problem. Then, I would fill a syringe and spot dose the problem area with a full days dosage. Just remember that Easy Carbon (or API C02) does nothing to combat long term algae causes - which are: an imbalance of Light, Nutrients, and Carbon Dioxide.
However, this does not negate in any way @Lennie's comments. In fact, there is an interesting discussion in a video on Green Aqua's channel in which one of the famous aquascapers (don't remember who) mentioned a study in which it was found that tanks that were routinely dosed with liquid carbon fared worse over the long term than non -dosed tanks. Balaz was incredulous as they dose liquid carbon with an auto-doser.
So there ya go. 🙂