A skimmer wont work well in distilled water either.
The way I view my sump is to prioritize the skimmer since it is more efficient at removing DOCs than the macro. The macro is there to help remove the things the skimmer cannot, not the other way around.
If the algae is tasked with removing things the skimmer can remove then you are not utilizing your skimmer efficiently and you are wasting money running it.
Unless you are cultivating pods, you are not trying to get your macro to thrive, you are trying to get it to remove undesirable chemicals from the water. I would much rather have a fuge with slow growing macro than a fuge with abundantly growing macro, it means there is less crap in the water to remove and a sign of good water parameters.
JMO, dont want anyone to view this as a pissing contest. Many reefers here have their own way of running sumps. And, unless you have all your flow directed to these components, then the actual efficiency gains are on an OCD scale.