what can destrees a fish

Many things can distress fish. Poor water quality, sudden changes in temperature, sudden noises, turning on the tank light in a dark room, fast movement, other fish picking on them and there are many others. Why do you ask? :)
 
If you meant to relax or to calm them then oftentimes removing them to their own tank, such as a hospital tank or dividing them from the main tank will help them to recover. If you're adding new fish to an already established community, then moving the decorations around will cause territories to break up, causing the fish to be able to lay low and get adjusted during the chaos. Perhaps, most importantly, water quality and parameters should be maintained according to the particular fish species. Check pH, ammonia, nitrites, nitrates, hardness levels to make sure it matches your particular fish. Hope this helps!
 
If you wanna relax them, Add hiding places for them, make sure the water is alright in terms of quality. Don't add big fishes where small fishes are, that would keep the smaller ones afraid all the time. :D Add a background wallpaper if you dun have one, it will make fish feel less expose.
 

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