My Piranha have gotten about 3 inches each. I thought that this was big enough to take off the filter from my powerhead. But I was mistaken. about half an hour after having taken the filter off and had the powerhead running I looked over to see one of my P's stuck sideways being sucked into the intake on the PH. I unplugged it right away and he swam to the bottom and rested. I took a look at him and he has a major indentation on his side from the force of the powerhead sucking up. the area around the "crop circle" has gotten red and black. I think it might just be brusing but I am worried about internal damage to the P. He is shoaling and swimming around but I am still worried about his health. I there anything that I can do besides keep checks on him ? thanks.