most aggro!!!!

[tydus]

There are literally thousands of species of african cichlids. So many of them are aggressive, so it would be hard to pick to declare most aggressive.

 

[swede]

just list a few of the meanest you know of

 

[krichardson]

Also,I've had Fossachromis Rostratus on different occasions and they were hell raisers.My Emperor Cichlid can be relentessly mean,especially with newcomers.