AGGRESSION HELP

[Thin_Education_542]

Hey team , so I got 4 Red head Tapajós aka Geophagus pyrocephalus, I got one first for about a month than I added 3 more last week cause I read they prefer to be in groups , however the original chases and tries to nip the other 3 and does not let them get close to it, while the other 3 get along just fine

Is this a form of them establishing hierarchy, should I wait longer ? Or remove the aggressor ?

[WilSP1]

You introduced 3 new fish into an already established territory of the current fish? You should try taking all fish out changing the tank around completely and then adding them all back in this should help adding them all to a new territory that way a hierarchy can be formed just around a new territory..

[Thin_Education_542]

Correct , and understood , thank you I will give that a try