dingweding

i decided to try PPS-Pro for my shrimp tank.

The tank is 90L, about 24 US Gallon, light is 2x24w 6500k and 1x24w 4000k.

Currently tank NO3 is 0, GH is 13, KH is 8, PH is 7.4
Tap water NO3 is 50, GH is 16, KH is 10, PH is 7.6

Pressurised CO2 about 2 bubble per second, off at night

the ligt is on 4 hours, off 2 hours and on 4 hours again.

tank is about one month old, quite heavily planted.

i have some question about PPS-PRO,

first, do i have to use distilled water? where can i get it? i live in London, UK.
second, i should dose 2.4ml solution(24 drop) from two bottle every day? at same time?
third, my water is very hard, do i still have to dose Mg? i remember somewhere is a fomula to calculate the Mg value, but i can not find it any more.

Last, for micro, i have Trace, i have no idea what inside, i bought it with other dry fertiliszer, can i use it?

Many thanks