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I had some neons do this for a while... and today I caught 2 new denisons in my QT sleeping completely vertically several hours after lights out. Is this a sign of illness, or normal?

I did test my water and found a trace of ammonia (0.25?) but I had treated the tank with Prime already so it should not have harmed them. Did a 40% WC anyway just to be safe. It's a bump from adding 3 new fish to QT.
 

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That's how my tiger barbs and emperor tetras sleep but I wouldn't call it completely vertical. More like "somewhat" vertical.
 

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Thanks Romad :)

Fish are all fine this morning so maybe it's just a normal thing for them. Last night I thought they must be dying and did a late night water change... maybe it saved them or maybe they were fine to begin with!:lol: Guess I will never know.
 
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