as long as you stay in the range of 1.021 and 1,026 your right in the center of the salinity scale at 1.024 that is a perfect medium IMO
Bristol worms serve 2 purposes the first is a member of the clean up crew . the second is when you see them getting large and multiplying thats a good indicator your over feeding
those tiny stars are fine in small numbers if you see the numbers increasing you can control that during water change just siphon them out there more annoying than anything else.
as for CAL check MAG like stated above than go from there