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Estimative method/Barr method


This gives a bit more in depth discussion of it.

In a nutshell: you maintain a stable level of nutrients by doing large
weekly waters that prevents anything from becoming to high/in excess and
dosing every week to up to 3-4x a week(depending on light intensity/plant
biomass) to make sure nothing runs out and causes a deficiency.

Using the nutrients listed: it's cheap, requires only testing for CO2, uses
basic aquarium maintenance skills to deal with plant health.

Tom Barr