I have made a number of comments going way back about the problems with using Fe as a proxy for testing traces.
I'd suggest tossing the test kit and not using it.
Rather, use the tank's volume and dose mls/tank volume/3x a week.
This is far more reliable and standard than any test kit.
It is the same dose in the USA as it is in Malta.
5mls 3x a week per 80 liter tank is a max rate of need.
Adding more will not improve plant growth/health at 1.5w/liter.
So you can add that much and then reduce it down till you have negative plant health.
You need to account for the other major players: light, CO2, PO4, NO3, K, GH and make sure these are non limiting before you do this.
Traces will have the least impact on the plant health, light, then CO2, then NO3 etc will have the most dramatic impact.
If excess Fe causes algae, why have for the last 1 5 years and more tanks than I can count have not had algae?
Same for PO4 etc.
They have had awesome growth and health with no algae.
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