Let’s look at some of the most aggressive pet fish species now ... We recommend a 75-gallon tank for a single adult Oscar.

there are not very many fish that can be kept with them. Oscar. Oscars are usually not very aggressive towards other fish, but they are not very friendly to aquarium decor. These fish can grow up ...

They go by many names, including velvet cichlids, tiger Oscar, and marbled ... They are semi-aggressive fish that reach ...