Hey there Juicy well you are well on your way with the nutrient export. if you sont have alot of corals in there may be see if saltynuts AKA EDDIE can take them
loose the lighting period for a week.
Still run the refugium lioght tho.
bump up the phos ban the maxi is excellent for the reactor too.
as for a skimmer, if you are running a huge FOWLR then get a excellent skimmer to work against the BIO LOAD. the skimmer is going to slow down the water changes for you and help in the aid of removing hte organic's in the tank extra nutrients ETC ETC. if you can buy a good external or if you sump will allow you. these are the skimmers that I would look at.
you want RAW POWER and a huge pressure pump for FOWLR a BECKETT or a dual Beckett.
Talk to Lando at Marine Aquaria he has a huge Dual Beckett that he might want to get rid off. the key with Becketts that you need a strong pump to run them and a good spot to put them at.
for a in sump the cone skimmer from vertex the 300 J&L has them,
the Deltec AP902 AP702, AP851 are awesome skimmers
the Bubble king is a great skimmer too SM200,SM 250, SM 300,
but there is a dowen fall they are very expensive skimmer's TRUST ME I KNOW.
can your sump handle a huge skimmer or not if not get a external. then you can keep the refugium going on your sump.
HTH.
P.S test you well for PO4, and high ALK Soug on here had a huge issue with HIgh ALK, so you may have HIGH PO4