Want to add these to my tank soon before the other fish get to aggressive Im thinking about getting 5 yellows and two purples.... what do yall think. already my tank has 2-SMALL yellow belly hippos, 1-SMALL blue hippo, 1- Juvenile Chevron, and 1-Large Achilles, 4- small clowns, and a small 6-line. all fish have been added within the week. Tank is 72x30x24