In article ,
Philippe Lemaire \(remove oldies\) wrote:
Richard Sexton wrote:

It shouldn't. Where were you ading potassium.

If you chnage half he water once a week it'll take care of any
imbalances although you may need ot make two 80% water changes
to get rid of any current exess wastes (like too much K).

If you think it doesnt come from the substrate, it shall come from the
trace mix...

There is literally only a trace of potassium in iron/trace mix.

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