Shagrathanswered grow question 4 years ago Hi there!
The way I'm doing it is like this: I keep the nutrients unchanged if I keep the same numbers there and if I change something I change the numbers.
Well actually I'm toppin my reservoir (Hydro grow) like once a week and top it to match roughly the numbers I'm telling in my diary. Most of these numbers are for reference and I think they are mostly for your own record keeping.