After some more research i think ive got a idea on what id would likeA Senegal Bichir would work but can't defend itself against high aggressive tankmates. I personally had 4 live with a male Firemouth that's my avatar. The Firemouth got a little pushy after around 3yrs so removed him.
1: Green Severum
2: Firemouths
3 Pictus
1 Bichir
5-6 silver dollars (Loved them aswell for a while but im not sure if tank is long enough)