After some help again guys 😬

I had been having black spot issues, added some more salt to hopefully promote shedding, no more deaths since and not noticed any more black on the others 🤞 Ordered some stuff to test the water and I need some help identifying the pH... I can't work out what it is, to me it doesn't look like any of the colours 🙄 Also my salinity is at around 40ppt to help with shedding but how will I get that back to 35 when the issues has gone? Thanks