Eh it depends, my 2 sevs went from penny size to 7" or so in a year, that's not too bad. Since then they've added 1" maybe but they're thicker.
If you do that I would get at least 5 of whatever geo you pick, they are more interesting in a larger group and you'll see more natural behavior; I currently have 4 S. jurupari and really want to add 2 more.
The A. heckelli suggested above are really striking fish and would fit the bill, but bear in mind if you pick them they can and will eat small fish, so a tetra school of some kind would be out; severums or uaru won't do that.
cool so i could have say 5 geophagus and 2 severums in my 90 for now and that should be fine? Whats the biggest fish a thread-fin would take at full size? What about firemouths? How would they interact with the severums?
Firemouth might cause some stress. My firemouth killed my gold severum. Well I think he did. lol came back and it was belly up with eye balls missing. Grew the severum to 3" also.
