With any silica, it needs to be added to the RO first, then the cal/mag and Flora Blend. Then take a PPM reading and subtract it from your target PPM reading. What number is left is how many PPM to fill up with gro/micro/bloom. I've found that GH CALiMAGic has the most dissolved solids of those 3 amendments so if I'm not seeing a cal or mag deficiency, I try to dial the ml/gal ratio down so I have more room for the 3 part.
The last time I mixed, my calculations were way off and I ended up making a ppm mix of 1100. I then mixed that with plain RO water throughout the week to bring it to acceptable levels, and I also forgot to first get the calmag mixed in before the 3 part. But when I mixed it all together, I took readings of each and here's what those numbers looked like;
5 gal/ro------------7.0/05
12ml Armor Si --- 9.4/39
20ml Blend ------- 9.1/80
35ml Gro --------- 8.0/400
25ml Micro ------- 7.5/780
15ml Bloom ------- 6.5/897
15ml CALiMAGic - 6.3/1100
4ml PH DOWN --- 5.5/1080, to determine the ml/gal ratio, divide the ml given by 5 (5 gal). The calmag, at a weak strength still made my PPM climb 200.