Don't know if I said this in the past but my RTGG's used be in with a Aussy Aro, and I had to remove the Aro because it attemped on more than one occasion to eat my RTGG's, of course they where much smaller back then and the Aro was like 12~14 inches, the Aro got some pretty bad fin damage too so I give it back to the person that give it too me.
Hmmm.... maybe that what I need to do is replace the dam Aussy back in the tank, it's like 2 footer now. Beat you that'll scare the messy out of the RTGG's.