1st save yourself some $ and after you finish those bottles don't buy anymore. Check out Bulk Reef Supply
for your alk
, calcium and magnesium supplements. Totally forget about the Purple Up and what's your iodine level? Never dose anything you don't test. When evaporation occurs, only pure water evaporates. Everything else stays.
According to the Reef Chemistry Calculator
, assuming you have 40g total water volume, you need 5.7 capfuls to raise your alk
from 8 to 10 dKH
using Seachem Reef Carbonate.
Using Reef Crystals, your mag should be OK. In fact your parameters are pretty much right in line with what you should get using Reef Crystals. I would suggest not messing around too much with additives. You parameters are fine now and you can easily throw them out of balance.
Chemipure Elite is not an efficient phosphate remover, even if they claim it is. Can you post a few pics of your tank? A pic tells 1000 words.