Tank looks great Sean! I'm digging the stylos. How picky are they for an SPS?
I'm also digging the stylos, I want more lol.
They seem to not be particularly picky, I have three different montis (a frontosa, a capricornis and one that I'm not too sure - brown flesh, bright flourescent green polyps, forms sort of knobbly digits) and they seem about the same as far as care requirements for the most part. The Stylos are definitely easier than the Acropora, I honestly would put them somewhere around a Birdsnest or a Monti for ease of care. My tank is set up well for them so it's hard to comment on how picky they would be in a tank that isn't meticulously cleaned fairly regularly.
They seem to be pretty tolerant of changing conditions when I create detritus storms every day or two and regain polyp extension much more quickly than the acros after being disturbed. I've also seen the green Stylo eat baby brine shrimp (which was cool), the polyps are large for an SPS on that particular Stylo.
They seem to be growing quite quickly as well (other than the ORA pink stylo which while growing isn't quite as noticeable as the other two which are closer to colonies than frags.) They grow slower than my two birdsnest corals but faster than two of the three montis I have.
I've never lost a Stylophora, I've lost several acros and even a few birdsnests. They seem easy to keep at least with my set up.
For reference I keep my nitrate around 2-3 ppm, orthophosphate is typically between 0.04 and 0.16, calcium 410 ish, alkalinity I try to keep between 8 and 9 dkh, typically it sits at about 8.4. magnesium stays above 1300 ppm. Potassium I dose to keep it above 410 ppm, Iron I dose 0.05 ppm daily, I have lots of green corals which (if you are to believe red sea) consume iron to produce the green pigments, since adding the iron the greens have seemingly gotten more vivid. Same with Potassium and reds, and iodine and pinks. I test for each element weekly, and dose daily.
I do a water change whenever my nitrate is above 3 ppm, or phosphate above 0.16, or if the tank just seems dirty regardless of numbers. When doing water changes I kill everything but the light, then take the turkey baster to all the nooks and crannies in the rocks, then let everything settle for a minute or two before more carefully turkey bastering the rocks while trying not to disturb the settled detritus, I then use a small diameter hose to slowly fill (typically) 2 five gallon buckets with water slowly drawn off the bottom of the tank where all the settled detritus and fish poo is. I then throw a filter sock on the drain before starting everything back up. I remove the filter sock after about an hour once the tank clears.
I turkey baste the rocks probably every day, though I may miss a day here and there.
I fairly aggressively attack detritus as well as bio fouling on the piping and inside the overflow boxes and sump and so on.
If you do these things you will probably have success lol