I have just started keepin polys and I have noticed my ornate is starting to become aggressive towards my del. Both are around 7" I am keeping them in a 6foot 125, but I have it divided in half until I can get rid of my clown knife. If after opening up the whole tank and the aggression does not stop is there anything I can do to help stop it? Would adding one or two more help or would I need to remove one of the two.