Aww Not My Crowntail!

[Dart]

So i noticed my crowntail was bring a bit lethargic sunday night and i hadn't done my water changes that week yet, bad me but it was midterm season.

So i changed his water and conditioned it how i always do. ANd he swam around happily in it. Yesterday night i noticed he has having a hard time swimming, eratic almost and i came back like 2 hrs later and he was dead

I examed the body to try to see if there was somehting wrong with him, and i couldn't see anything. Is there any illness that is like a silent killer and should i be worried about it for my other boys?

 

[nino]

Did you do some cleaning near him? I think people's fish have died from chemicals of window cleaner and it left the fish with no physical traces or clues as to why it died.

 

[Dart]

Not that i'm aware of,