Totally agree that you can keep green terrors in groups, just need a large enough tank and large enough group. Can make an impressive tank. I've seen all male tanks or single male with harems. You can also keep just one, whoever implied it's not good to keep just one was either trying to sell you more fish or didn't know what they were talking about. Ime male/female pairs are ok, but like a lot of other cichlids, this is if they 'like' each other, so not guaranteed. Small groups, like 3 or 4, it's going to depend-- age, gender makeup of the group, tank size.
Personally, I've kept a lot of single males, but also pairs, or trios with just one male.
Personally, I've kept a lot of single males, but also pairs, or trios with just one male.



