Bro,
If you plan to put 10% Mg in your CR... the PH should be at 6.3 for Mg to dissolve at Optimum level... adding Mg initially will bring the PH to as high as 9-10.. so be careful to monitor the PH in your for few weeks ..
Hey... no problem bro... we can re-arrange when the time comes..
But I believe I will be camped in Hong Kong more often than Japanese... over there I am very familiar with the LFS ... can also let me know if you are going there...