If i increase my temperature by a couple degrees that could likely make my piranas more aggressive rite? But whats the hottest i wanna go? around 84 85 degrees? My temp is steady between 79 and 80 degrees, how much hotter should i go? Also i am slowly getting rid of an algae problem. It had taken over the tank, and now is begining to finally go away. By increasing the temperature will it afect the algae? Im more concerned with getting rid of the algae at the moment, so if reducing the temperature means a faster time untill the algae goes away then i would be fine doing that.