OmniTranz;3325670; said:At the Denver Aquarium (professionally run) they have a tank with silver, black and gold aro's in with several jardini's, aropimas, royal clown knifes...a pretty impressive tank (of course it's probably 1,000+ gal). They all appeared to get along, however what I've noted in my tanks appeared to be true there as well, if the largest fish is more passive it seems to keep a lid on the smaller, more aggressive fish. In the Denver Aquarium, the aropima was by far the largest so the jars and aro's seemed fairly calm.
I've gone to the Denver aquarium many times. I enjoy the aro display too however, I do not believe they play nicely together always. I've seen some of those aros with some split fins and some seem to have found there territory where no one bothers them and they don't go and bother anyone else. And as you said, that Denver aquarium is gigantic. That 60g tank, as the thread starter has, will probably be a blood bath for a poor black aro. I've seen my small 3" jar go on a fighting spree picking fights with my 3" distichodus, and 3" IT. Needless to say, that jar got returned the next day. If I had to choose, I'd get rid of the jar and get the black. In Denver, they're pretty common, but blacks are much harder to come by.