I am contemplating on the 20 gallon deal...I am goin to set it up anyway for emergency. I have been watching the black aro in the tank, so far so good. I have been feeding the living crap out of the other fish so that they don't bother him.
My last fei feng at 5" were picked on the moment in enter the tank. The aro seems to be in the world of his own and no other fish is bothering him including the TSN. I am sure it'll be okay...
I'll keep an eye, when in doubt, I'll put him in the 20 for temporaryli until I get a 75 0r 55 setup for him.
stan