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Austin, I wouldn't worry too much about the macro taking up to many nutrients. That's not normally the case you control the amount of light the macro gets. I would recommend starting off with 6 hours and if the macro is not consuming enough nutrients then bump up the hours the light is on. I run my macro light the opposite of my tank lights. I have had other tanks I have run the macro light 24/7.
Hope this helps.
This macro algae is new to me as well. I have a jbj 45 and it has three chambers in the back the filter compartment empty one(where I put my chaeto) and then return pump chamber. I was told to run my light which is a led light bulb from Home Depot with a 6500k rating which is growing my chaeto awesome trimmed it twice since putting the light on. I still have a couple tiny spots of algae in my DT. You’re saying by runnin the light 24/7 for a few days will absorb more nutrients in an attempt to get rid of the rest of the algae in the tank?