the reason i asked him to do daily is the size of the tank when i had my nano's it changed day to day. A 5 day peek of levels can give him an idea whats going on. i would do 5 days of test and then water change then another 5 days. its going to be a PITA but after that we can help you decide what to do.

i know you only have a small system but the best test kit ive used is the HANNA checker for calcium. its easy and accurate, just need to make sure the water you use is zero tds, and itsd only 20-30 more than the other kits.