You have some kind of hap in there, too?Providing your growout tank has enough space, chances are the Festae will establish dominance over the Red Hooks in a non lethal manner. As long as the RH's are too big to eat, and the Festae doesn't sense a threat, things will probably work out. Heres an old pic of one of my tanks w/ Festae, Rivulatus and a school of Spotted Silver Dollars. Things went well for quite a while before I changed it up.View attachment 1356967