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Well, If he's talking about Dutch Master silica, the recommendation is 2 ml per gal or in his case 12ml for his 25 liters.
That's what I noticed after I posted and went to look at it. I think you meant to say the rec was 1mL/2L or 0.5mL/L (this is what my web search turned up).
If that's the case we're talking about double the dosage.
Silica is some SERIOUS shit, and it does very uncool things on a molecular scale. It is one of the most abundant elements in soil--but most of this is immobile and insoluble. It is released exceedingly slowly.
Now I don't know if this could cause a hermie--but I think it's probably a good start. Silica participates in very special chemistry.
If you check out the periodic table of elements, you'll notice that Si is in the same group (column) as Carbon. Of all the elements, it acts the most like carbon. Phosphorus is a close second place in this regard--and you'll note likewise that we're often super baffled about phosphorus or how to properly treat it for plant applications. It is typically the limiting agent in flowering applications and it's because of the "weirdness" of this type of chemistry (where more than 3 bonds are possible). Boron also does some weird shit in this same vein by not following the octet rule, but this is less important.
What this means from a practical standpoint is that it really likes to make bonds with shit--and it grabs on to lots of stuff in an attempt to do that. It doesn't always end up making a bond but it can form what are known as complexes and it can be difficult for plants to take complexes up--or to wrest control of a cation that it wants from a silicon complex.
If you've got double the recommended amount in there, I'm thinking it could very well be preventing uptake of other nutrients. I'd actually be surprised to find out that it wouldn't be precipitating some stuff out at that concentration. It's known to do this even at recommended doses.
When it comes to silica I typically only add it once every other watering at most (the plant doesn't need all that much, especially in flower)--but I mean that's just personal preference, and I don't grow in coco as I've discussed.
Again, I'm not sure that even if this DID cause a hermie that it would totally absolve the genetics--but it's something to look into for sure.