With space being an issue this may not be any better of a solution but you could look into an algal scrubber to remove nitrates instead of a skimmer. They of course require more work and are a bit unsightly IMO if not hidden well. Also if you have access to mangroves I think they are supposed to remove nitrates. Could throw some of those in your sump with a light if you dont have one...
FWIW I dont use any of the above options just food for thought as I see others are using them.
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