Hi JD.....many people switch the SW mix if they are not happy. I use Oceanic...dissolves quickly. If I was going to change tho', I would probably phase out the old stuff by serially increasing the mix of the new one with the other. Interesting note tho'...if you go back to page 1 of this thread, I put a link to an ariticle written by an R Shimek (writes excellent stuff) showing a study comparing Crystal Marinemix, Instant Ocean and Corallife salt mix. The findings are very interesting...compelling enough that I was looking for where they sell it. Gonna hang with Oceanic for now.
Similar to your Ca2+ problem, I am having a 'pH problem' in that my pH is 8.2 at mixing and 7.8 after adding. I'm comfortable for now that it may be a new tank/cycling thing (?organic acids) as others have posted similarly. I'm not going to adjust it. Despite this, everyone looks happy in the tank for now. SH
Similar to your Ca2+ problem, I am having a 'pH problem' in that my pH is 8.2 at mixing and 7.8 after adding. I'm comfortable for now that it may be a new tank/cycling thing (?organic acids) as others have posted similarly. I'm not going to adjust it. Despite this, everyone looks happy in the tank for now. SH