I have 3 STs from 7" - 8.5" growing out in a 100 and they don't have any serious fights. In my 200, I had 5 from 8.5" - 10" and one of my 10 inchers was a beast and chased the others frequently. Since I've gotten rid of him, the remaining 4 all seem to get along just fine. I have also seen situations where two STs have coexisted just fine together. I think it depends a lot on the temperament of the STs you have.
I have also not seen any problems arising between my 20" silver aro and my larger STs. They pretty much leave each other alone.
I personally think you will be okay with the 3 of them together in the 220. But expect some torn tail fins for a while as they work out their pecking order.
I have also not seen any problems arising between my 20" silver aro and my larger STs. They pretty much leave each other alone.
I personally think you will be okay with the 3 of them together in the 220. But expect some torn tail fins for a while as they work out their pecking order.