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Hi Koialki,
a couple of things- a 'crash' of a an established filter- ANY type of filter is unrelated to the media type--
*check your pH
*check your alkaline reserve
*check to see that your test is reading accurate ( stored well and not dated)
*check to see if the nitrite is a problem as it is likely going to be.
* Obviously, do not feed the fish.
JR
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