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Not necessarily - if you completely remove all the water, you could lose most of your beneficial bacteria that helped to establish your tank when it cycled. If your fish died from something parasitic, then yes, you need to clean absolutely everything. If it died due to a water quality issue, then no.

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11y ago
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14y ago

First thing I would recommend would be a water test, primarily PH, Salinity (if salt or brackish), ammonia, nitrite, nitrate. Fish death does produce ammonia but your bacterial load should compensate for it unless a newer tank. If these where your first fish in a new tank then no, do not do a water change. If an established tank then if your water test shows any issues then a water change may be needed.

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Q: I have 2 fish 1 died do I change the water?
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