AsNoriuanswered grow question 3 years ago I was questioning it for first two years, wrote to all manufacturers I was using products off and never got clear answer , so I went my personal way and it's working !!!
If I have to use silica, Cal mag or any other additive I use it next waterings after I gave feed so it looks something like this :
Full BioBizz feed
Water + CalMag
Water + silica
Water
Full BioBizz feed
And etc
For me it makes magic, especially when I use silica in certain stages and Cal mag only if I see first signs of need.
All the Best !