Some say they will and others say not. I agree with the above, the cause needs treating. I also agree with Standby regarding upping the flow a bit to reduce the dead spots. Which tank is it in Matt? If it's the smaller tank, a school of Otos work best IMO/IME. If its the big one the may end up as food.
edit, it's the 240...sorry my bad for not reading.
edit, it's the 240...sorry my bad for not reading.