Timfish
Crusty Old Salt
@Jon Malkerson You may have already notice but some of these comments were made without ever taking the time to read research you refferenced and I posted links to in your other thread. 
It is true you will need to do water changes. But that is true irregardless of any methodology you use. The best way, and pehaps the only way, to get rid of the hydrophilic DOC algae release that causes problems with coral microbiomes is with water changes. Skimmers can't touch it, GAC doesn't remove it (otherwise carbon dosing would come with the warning to not use GAC), ozone (beside being very difficult to monitor or use appropriately, Charles Delbeek, Next Wave 2011) breaks down the refractory component of DOC into type that promote heterotrophic bacteria, again something we don't necessarily want. SPonges do do a FAST job of processing DOC but we need to keep in mind they know the difference of DOC from algae and DOC from corals and process tehm differently and there is concern in the scientific community of positive feedback loops between sponges and algae shifting reef ecosystems to algae dominate or sponge dominate systems.
The extent you will need to do water changes is up to you to determine, you may get by with 5% - 10%, you may need 20-%-30%. I'd start with a larger number myself.
It is true you will need to do water changes. But that is true irregardless of any methodology you use. The best way, and pehaps the only way, to get rid of the hydrophilic DOC algae release that causes problems with coral microbiomes is with water changes. Skimmers can't touch it, GAC doesn't remove it (otherwise carbon dosing would come with the warning to not use GAC), ozone (beside being very difficult to monitor or use appropriately, Charles Delbeek, Next Wave 2011) breaks down the refractory component of DOC into type that promote heterotrophic bacteria, again something we don't necessarily want. SPonges do do a FAST job of processing DOC but we need to keep in mind they know the difference of DOC from algae and DOC from corals and process tehm differently and there is concern in the scientific community of positive feedback loops between sponges and algae shifting reef ecosystems to algae dominate or sponge dominate systems.
The extent you will need to do water changes is up to you to determine, you may get by with 5% - 10%, you may need 20-%-30%. I'd start with a larger number myself.
Unless you created a phoshpate deficiency in your corals I would not lower you lights, it will only force your corals to adjust their photobiology, reduce the available photosynthates they get from their simbionts and reduce their ability to compete with algae in your system. If a phospahte deficiency has been created that might be a reason to lower your lights as it makes corals very sensitive to temperature changes as well but keep in mind not knowing the numbers of zooxanthellae there's a huge guess factor involved with that. 
