Not sure what you mean by too high.
Too high means you are wasting it, but otherwise I do not know what too high levels of Fe are.
Testing Fe is a huge issue and wrought with many issues.
Best to add volumetrically over a prescribved time peroid(a rate).
Eg:
mls/day, or mls/2-3days etc
This is much more consistent rate of dosing than trying to use a test measurement.
That introduces error.
The indirect method to determine if you have enough traces:
Get the other variables correct in the range you want them, CO2/Light/NPK, GH etc.
Then add say 2mls per 20 gal every 2 days, note plant health and growth over at least a 3 week peroid.
Add 3mls the following 3 week peroid, keep raising the the dosing volume until no improvement in growth is noted.
Traces will be subtle so a careful eye is needed and a careful control of the other nutrients while you determine this.
For flourish at a a light level of 5.5 w/gal of PC's, I found every other day 5mls /20 gal was the max the tank would need.
You can add this much but your tank will probably use less than this.
But your tank will not run out of any traces with that dosage.
2-3x a week at 5mls/20 gal works well for most CO2 enriched tanks.
Regards,
Tom Barr
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