My reciepe to keeping sps in a 50 gallon waterbox with 1 xr15 and 2 orphex strip light, and 1 in tank ws skimmer.Started with 40 pounds hatian live rock, w\c a least every 2 weeks, dose brightwells code a and b make from powder,also a hang on refuge with miracle mud and cheato,Alot of flow, in the current market there is alot of different pumps you can get.Dont chase numbers try to keep it basic exp heatersand salinity.aslo get fish in there and feed.Dont chase numbers and i contribute my sucess is to use ro\di water and make sure reading 0 tds.
I try note to use phosphate remover
also i use a low phospherous meter
Carbon occasionaly just to polish water
Test alk frequently
Took about 14 months to alk to settle in, now i test alk once a week sometimes twice,also make sure your calcium is at least 400
Sps like w\c especially every 2 weeks in a mature system about 20 percent
I dose 2 part twice , once in morning around 10 and at night around 10
I noticed my sps where healthiest around 1 . 5 years, they are and encrusting where they are fighting now
Note: good indiciation which most people keeping sps is coraline algae incrusting alot.
Also start ur corals low get a frag rack and move up especially if you are using halides.
Dont add to many chemicals at once , i try note to add any.
Note: i do add oyster feast, reef roids , phyto,but feeding fish is the most important, just watch your phosphates, but phospahates are ok corals need it not too high
Sps are verysensitive but if your system is mature they will thrive
Good luck keep it basic and dont sweat it out