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I have had shrinkage due to lack of traces, my iron bottomed out and my big ball of chaeto shrank significantly and left me with high nutrients. But I haven't whitnessed shrinkage due to lack of nutrients so this may be true.Do you want to grow Chaeto or are you just trying to remove nutrients by growing Chaeto? Not sure why you would worry about the Chaeto thriving or starving. If it grows it is working. I doubt that it will shrivel, the stuff is indestructible and it will start growing as the tank gets dirty. No need to speed that up, it will happen as your system get older.