Jardini aggression varies with each individual fish. Some people say around 8"-10" the mean streak comes out, others say 10"-to 12"... I think it really depends on the fish. Jars also seem to be slow growers as opposed to silvers(my little jar has only grown about 1/2"/month). I'm not sure on cichla growth(never owned any) ,But I'd be worried that the p-bass may out grow and eat your jar
Good luck and post up some pics
...
----Chris

Good luck and post up some pics
...----Chris

