I got to agree with every one here.
The Top-max product liberates calcium but does not say it adds it. mainly humic acids.
growdiaries.com/nutrients/biobizz/top-max
https://www.biobizz.com/wp-content/uploads/2021/03/Data-Sheets-General-EN-Top-Max.pdf
where as CalMg has the extra calcium you need
growdiaries.com/nutrients/biobizz/calmag
https://www.biobizz.com/wp-content/uploads/2021/03/Data-Sheets-General-EN-CALMAG.pdf
If your on week 5 calmeg should be .5ml/L of water to prevent deficiencies according to BioBizz feeding schedules.
Best Of Luck!