Yes, a dead fish can contaminate a tank by releasing harmful bacteria and toxins into the water, potentially affecting the health of other fish in the tank.
Yes it can.
no - never buy a fish from a tank with a dead one in
Yes.That happend to me a few days ago, one fish died, and then all of the others died except one.:(
A basic rule is never to buy a fish from a tank that is suspect or dirty. Buying from a tank with dead fish in is a definite no no. I would not even consider buying anything from a pet shop if they had dead fish in aquariums on display.
Not necessarily. If it is sleeping, you can look close and see its gills moving. When a fish sleeps, it also waves its fins just a little. You will also see its mouth opening every once in a while. If you think your fish is dead, DO NOT tap the glass or try to touch it. This will disturb and maybe kill the other fish and the sleeping fish (if it is alive). Just observe the "dead" fish for a couple of hours. If it doesn't move even its gills, go ahead and see what happens if you attempt to remove it with your fish net. If it doesn't do anything you can assume it's dead. Flush or bury it. Do not let it sit in the fish tank once you've found it is dead. It may contaminate the other fish.
Dead or dying
if you can live with the smell
A dead fish can start negatively impacting water quality and other fish in a tank within a few hours. It is important to remove the dead fish promptly to maintain a healthy environment for the remaining fish.
ummm your fish is dead....sorry.......
Could be anywhere.
Smell the tank, if it smells like a dead fish, then a hermie is dead :(:(
it depends what kind of fish they are, and maybe how long you leave the dead fish in the tank. meat-eating fish probably would, but others wouldnt...