Those bottle recommendations are assuming it is for someone with a "fish tank"
and a few plants.
With highlight Co2 injection, you will need to dose according to the sticky above
based on tank size/volume of water either every other day or daily.
So yeah, it can get very expensive, you can use the retail traces as you wish
or get some Plantex CSM+B and add that to the dosing regime, using the retail
versions once a week and plantex for the remainder. or not.
Plantex is much much cheaper.
I use Flourish/TPN and Plantex, with Plantex being the main trace. I like the
retail versions, but they are pricey, Plantex does very well too.
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