I have an all-male peacock/hap tank & i recently added a powerhead to help with water movement. the fish seem to love "surfing" in the current but i have noticed that my sulfurhead has gotten more aggressive. he has claimed 1 rockpile & chases anyone that comes near. he did this when i started the tank but stopped when i added a larger eureka red. any ideas? i have not rearranged any decor yet but i plan on doing so. i was just wondering if the addition of the powerhead could make a fish more aggressive.