Did you check Silicate level in your tank? Diatoms not always appear in new tanks the feed on Silicate!
#refsquad
DIATOMS:
Diatoms are just a natural things that happens in a new aquarium and will normally will subside with in a few weeks to a couple months.
ID: This Algae normally forms on...
I'm kind of unfamiliar with the process and I'm very unsure the Ca, soda ash and Mg I use is even chelated. It's a question I've never encountered in 20 years in the hobby. How much into chemistry are these friends of yours that say this?
Lets try for some help here:
@Randy Holmes-Farley #refsquad