Arowana death

Man thought Arowana grew faster then 12 inches in a year. Did you do a water change when you seen him dead or did you test right then? I would assume that a dead Arowana would make it impossible for all your readings to still be 0.

No, as it appears it has died for a while.

All of sudden? Not many fish all of sudden dies. When was the last time the fish ate?

What's your filter and water change schedule? With large fish, unless you do drastic water changes or have plants in your tank, your nitrate will not be near zero.


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+1 something smells fishy? no pun intended.

He's been dead days. Like said before your water test would be less than perfect with a foot long rotting aro dead. That's a ton of bad news for water quality.

Next, had he been eating, acting peculiar, could he of jumped into the glass tops, was your tank full at the time of death or was there a gap between water level and glass tops?

What was his diet? How often you feed? How much water did you change and how often did you do tank maintenance? What's your filtration? How often do you clean your filters out? Honesty will only help you so don't be shy. Not saying you didn't take proper care of your tank but life happens
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You only do a wc every month or two? A good start would be to start doing a wc every week or so. The filters get cleaned twice a month. Clean water for the most part means no mysterious deaths. I'm viewing this on me cell phone but it looks like the eyes are clouded over which to me indicates a longer period of time of death.

Maybe elaborate more on your specifics to you can get help from members and figure out what's going on so you don't lose more fish

If I was to put a reason of your aro dying I would say water quality issues that lead to sickness.