I've had a tank somewhat similar to this. It seems with cichlids when they are crowded they won't fight as much since they really don't have a territory. Looking at the tinfoil barb though looks like he's getting bit on probably by those texas cichlids. I never trusted the meaner cichlids like the red devil and texas and flowerhorns, i've seen them bite the eyes out of arrowanas and clown knives. So far everyone in your tank looks ok, good job.
