Going out of town for about 7 days and my little 28 really depleats calcium and alk and while I have someone coming by to feed, I hate to rely on them to dose. I know you can't mix 2-part together, but could I add it to my top-off water without having crystalization issues? I evap about 1/3 gallon per day due to my thermoswitched fans and I would need 6ml of part A and B per 1/3 gallon. Any advice?