OSen eats sinking cichlid gold pellets, and is super healthy. I never worried about it, he lets them swim all around him, it even swims around with them. Everything in the tank is mixed malawi with the exception of a bleekeri and frontosa, which were musts. I just figured that when the ornate is atleast a foot, all the fish should be atleast 5". As far sen and ornate, I am not worried about that in the least bit... Just thought that maybe since the sen was so good with them now, the small ornate would be around them growing with it, and possibly work.