wow man i found your youtube videos and tracked you down here, man i really want to try and get more Polyp extension like your tank. i have all kinds of sps, im running 6 t5 IceCap and get loads of Par from them. im getting good growth but they just dont open up like yours. at night they open up a lot more but why are yours open in the day too? my buddy has a outdoor reef system and he gets lots of PE in the day too. im using a red sea berlin skimmer but it kinda runs on the dry side at best. i though i may have dirty water but your tank seems to like it i guess. its like compair apples and oranges i guess. you have a lot of equipment i dont. i got a skimmer, refugium, BRS 2 part CA & ALK, Chiller, T5's, and a bunch of powerheads. maybe its because i dont feed as much as you. i dont even turn the pumps off when feeding. maybe to much flow to feed? i dont know why they come out so much at night but not the day. PH shifts? i do have large PH shifts at night, maybe they like the lower ph. at night it goes to 7.8 sometimes acording to my ebay ph meter lol. in the day it hights 8.3 or more depending on if i am dosing to fast.