Who is Using a Refugium for Nutrient Control?

[BlueAbyss]

Caulerpa and Chaeto seem to be okay on a 24 hour photoperiod, but few (if any) other macros will tolerate this. Gracillaria needs a period of darkness every day for sure. Many people use refugiums as a source of food items (ie: pods) if they have no predators in there (no crabs, shrimps, fish, etc.)... others use them as a nutrient export. Many people have had good results combining a 'fuge with skimming and other filtration methods.