Do you notice plant growth? 64 watts is very very low. I saw you have more lights available though. If your plants are growing they will need the nutrients. Might just dose as if you had a 10 gallon tank though. So many other variable to consider. Such as, how many plants and what types. What do you consider minimal water changes, because traces can come from the fresh water from changes. Again more csm+b the fewer water changes. I still dont know how potassium gets into the aquarium system without external fertilization so I would add that always.
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