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Aquarium Fertilizers

Andy Moore wrote:

>Is it safe to assume that a commercially made basic plant fertiliser (one
>without the micro/macro ? nutrients that are easy depleted) contains
>Potassium/Magnesium etc. ?? Most basic aquatic plant fertilisers that I have
>come across in the UK (not many) do not list their ingredients.
>If my existing water is eg. low in Potassium (per a water report) can I
>safely assume that a basic fertiliser will correct this ?

I don't think it's safe to assume anything about any product that doesn't
list the ingredients on the label.  That is why I stick with those that do.
 There are a number of good aquarium fertilizers out there, but there are
also a fair number of poor ones.