Salinity problems? Once you add enough magnesium(obviously a type of salt that will raise your salinity) to bring the level to a set point, you can adjust to get to the right salinity. After that, you are just maintaining magnesium and no matter the level the coral can only use a set amount. I don't see where it should affect salinity more at a higher level, but I could be wrong.
Same with Calcium imo.
Well thats what I mean, if I went higher with Mg, my salinity would go up (obviously) and then I found my Ca would go down, likely parcipitating out (which changed the salinity again), so it made sence not to keep it so high. Also, my major being chemistry I'm well aware of solubility with realation to concentration of dissolved ions (salts), and at the higher levels of Mg my theory would be that the already relatively low solubility of the calcium salts (from a Ca reactor) resulted in them being unable to remain in solution at the higher concentrations of Mg. If I had been using "two part" it probably wouldn't have been as big an issue (as they are more soluble salts in a basic environment), though even then I would have had to lower the concentration of a different salt (NaCl in this case) inorder to maintain the ideal salinity overall. SUFFICE TO SAY... wasn't going to dick around with that just to get a bit higher Mg concentration. lol.