Hi, does fish aggression depends on tank size? heres an example http://www.youtube.com/watch?v=KXD-99CNcp4 those fish are known to be aggresive, but here they seemed to be very calmed and soft 
Fish aggression.
- Thread starter ArshadOscar
- Start date
Survey says No! Lol...each fish and set up is a case by case scenario. Ive had setups run for years with no issues only to check one day when theres distasters. They choose who lives or dies not you.
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It is possible. There are fish agressive in setups small and large, and fish peaceful in setups small and large. A tank too small can stress a fish. A big tank can give fish being bullied more places to hide. It also can give the less agresive fish room to swim that wont be in the agresive fish's teritory
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Large tanks can have tons of aggression. What enhances aggression is a complex relationship between species type, species sex, space, species age, availablity and desirability of food, water temperature, water chemistry, physical complexity of the tank, ability for fish to perceive each other, ability of fish to escape from each other, etc.
Now, taking fish from an overcrowded smaller tank and moving them all into a larger tank with all other factors being equal, may reduce aggression if space was an important driver and if the new tank has a dramatically large amount of space. E.g., going from a 200 gallon to a 1,500 gallon would probably reduce a lot of it. Going from 200 to 300, when space was not a big factor might have no effect.
Now, taking fish from an overcrowded smaller tank and moving them all into a larger tank with all other factors being equal, may reduce aggression if space was an important driver and if the new tank has a dramatically large amount of space. E.g., going from a 200 gallon to a 1,500 gallon would probably reduce a lot of it. Going from 200 to 300, when space was not a big factor might have no effect.
When I went from a 55 to a 125 aggression increased significantly. In the 55 things were crowded and no one had there own space. Once in the 125 they had space and set up territories which was defended.