OK, I think those numbers are wrong. 180 is way too low for Ca, and 240 converts to almsot 5 mEq/l, which is just wrong. Buy some test kits, because you really do need your own, and test your new water. That isn't a real populr slat, so I'm not familiar with the levels out of the bag.
Ideally Ca and alk should be about 350ppm and ~3mEq/l when mixed with RO. Some salts are higher.
Since you have nothing removing Ca fromsolution, bi-weekly water changes will be more than enough to keep your levels steady.
I recommend IO or Kent salt, but that's up to you.
Once you've got the levels I suggest, scrape some of the purple off the rocks; this will spread the spores through the tank and speed up the process. Your lights are fine for corraline algae.
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Brad
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