Prime Ordeal
Fish Herder
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You can't guarantee that there will be no ammonia in mineral water so it's not the best source to use.
And if the reading is always at 0.25 then either your filter isn't cycled (but then you'd expect an increase over the week), or the ammonia test is faulty, or you're reading it wrong. My bet is it's one of the latter two.
And if the reading is always at 0.25 then either your filter isn't cycled (but then you'd expect an increase over the week), or the ammonia test is faulty, or you're reading it wrong. My bet is it's one of the latter two.