hi guys wonder if anyone has got any good tips on calming over agressive severums hes in the tank with a 9" oscar two 5"parrots(paired off}and a 5"blue acara the severum is only 4"but hes beating up all the others this behaviour has only started recently but i have heared about increased feeding levels etc,can anyone suggest ideas or have any of you experianced this behavior thanks !!!

If you can, remove the Severum and the other fish involved in the aggression from the tank, rearrange the tank aquascaping and put them back in. Keep your lights off most of the day time and increase its time on gradually by the day.

As long as no one gets seriously hurt, you shouldn't panic.

Pepe
Santo Domingo

thanks for the info.....the other fish in the tank are all calm enough its just the severum who is quite small compared to the others ???i have kept all kinds of fish over the years including barbs and red bellied piranah but this severum is the terminator of the fish world!!!! the others have plenty of room to get out of his way but its a recent change of behaviour and i would like to know if there are any methods of calming aggression ,,thanks again

ive been fairly fortunate when it come to aggression in my tanks. when i first got my jags i knew that they would become a hazzard to my o's so as soon as they reached 4 inches in lengh i rehomed them into their own tank without any mates. this was planned for and i set myself up to deal with it.

unplanned aggression however is a different matter that i only ran into twice(for now) in my tanks. again, fortunetly, the aggression was only focused on one fish and not the entire tank. the first was with my jack dempsey constantly attacking my albino tiger. since i have 2 fairly large tanks it was just a matter of redistributing the fish stock i have an seperate the 2.

the second time it was male dominace thing between my year old red oscar and my 20 month old male tiger. again just redistributing the load solved this for me. i do know from friends that some fish are, for lack of a better term, born bad and will torment and even at times kill their tankmates. the only cure for this is to rehome the aggressor to his own tank or to someone else who has the room for them. unfortunatly their is no sure fire way to eleviate this.

the only thing i can think of is what pepe has suggested and redeorate your tank, try to break up lines of sight with plants or decorations and add the aggressor last. hopefully this will work.

good luck with your sev

How big is the tank?

Maybe you've just reached overload and things have come to a head?

For that many fish I'd be looking at 5-600ltrs

4 different types of fish need 4 different areas = big tank
competition = aggresion

thanks guys good sugestions ill try them out!!!!and keep the rehoming option if all else fails the tank is 600litres with large rocky rear wall with big mopani lumps and artificial planted areas (page 3 of the gallery)so they got sufficiant areas to get out of the sevs way thanks again guys ill let you know the outcome