Wait I'm not sure I understand... how many dead fish are we talking about here? 2 dead tangs in quick succession?
Yes if there's a dead fish in there you should absolutely remove it. Also test your water for ammonia, nitrite and nitrates. You don't want to start a chain reaction and crash your whole tank.
The question is why are your fish dying - how long have you had the ones that died? when was the last time you added a new fish? Are you sure they're getting an appropriate diet? Is there aggression issues in your tank that's preventing some fish from being able to eat or stressing them out badly? Are there any symptoms of disease on your other fish - specifically look for small white spots on your tangs, as they're most likely to show visible symptoms of ich if this is an issue.
If you experience multiple fish deaths close together, there's likely a much bigger problem going on. Either disease, water quality, nutrition or the social structure of your tank is out of whack. What kind of tangs are we talking about here? They're not all created equal, and if you've got something like a sohal in with 3 smaller and more docile tangs in a 150 gallon aquarium it's basically a recipe for carnage.
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