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Surface agitation would be a good investigation. My tests here produced 0 difference with both wave makers and the two return lines forced to create more surface agitation. My surface area is only 18” by 48” on a 150 gal tank. It Is a drop down tank with 40” on the deep end so my tank wouldn’t be a good option for testing surface agitation compared to an average tank with a set depth and a common surface area on a typical tank most reefers buy off the shelf. I do know that to much surface agitation do have some negatives, and mine was the amount of spray. Even though I have euro bracing and my hybrid T5/Led lights are mounted 9” + above the water line, It was to much for me to want to deal with (maintenance) to warrant more than 72 hours for testing purposes. I also have only one skimmer so testing skimmer agitation due to different sizes wasn’t an option.Watching this episode gave me a good idea for a brstv investigates. In the video you stated that the protein skimmer will have a much greater effect on pH than surface agitation, that has not been my experience. I have around 250 gallons system volume and I have an undersized skimmer and an oversized skimmer (currently running the undersized one. it works better) and neither one stabilized and raised my pH as much as a maxspect gyre shooting across the surface of the tank then later on increasing my flow through the sump so it also had a lot of agitated water. pH fluctuated from 7.6 to 8 with just skimmers, the gyre brought it up to 7.8 to 8. Now it stays between 8 to 8.1. You should look into that.