Sure do, but the gourami is too small to be worth bothering with. He's well fed enough not to need to eat it, and the gourami is not big enough to be a threat. The snakehead was a threat and was trying to bully the aro, that's why the aro bashed it, same as the loisellei.
He's also in with 3 5 inch bala sharks, and they get left alone too.