so far i have no significant agression in my tank and yes i have plans next year for a 150g for them. but for now the 90g is plenty for the 6 of them to grow out abit, the ornate is still tiny, Very tiny... 6-7" max less than 1" in diameter, shes a tiny girl (ive had her for 4mo now, has only grown an inch since i got her) both of my senegals are Very friendly (to the point they let me handle them in the tank), and the large bgk gets abit of an additude when its hungry.. but so long as its well fed it doesnt bother the other bgk, they even swim together