Okay, so I bought an AT dat a week ago. The other mid-dwelling fish in the tank with it are one gold severum, one blood red parrot and one leopard ctenopoma. All of these fish max out at roughly 12 inches with the ctenopoma maxing out at around 8-9 inches, right? If I bought an IT dat, it will max out at about 18-24 inches. Will the fish already in my stock be safe longterm with the IT dat? If not, I will not buy the IT.