I've always thought mangroves look cool in a fuge just not sure how much of a nutrient export it provides compared to chaeto and other macroalgaes. Did you add it for looks or do you think having an assortment of things in your refugium helps? I just have a couple different macros in mine.
I don't run a fuge and am very happy with my system. The only reason I would have to run one would be looks - and I admit they can look really nice. Aside from that I don't have a reason to consider one.
Well........I don't know about "Key", but certainly "Help". I have a dedicated refugium full of macro, and phosphates and nitrates have been zero since it went up 4 years ago.