What else to put in/ how to lower aggression

[619aquaponics]

Ok so I have a 55 gal with 2 green sunfish. Both are about 5 inches. One of them gets picked on and hides in the corner all day, only coming out during feeding. There is one piece of driftwood and some plants in the tank. Should I get another fish to spread the aggression? I can get bluegill or another sunfish.

I am going to add more rocks later

 

[Rays of Sunshine]

There will always be a dominant fish. The aggression level gets depends on the ruler. More hiding places will definitely help. Keep a close eye on the fish. Greens really like to have their own space and bluegills too. They don't appreciate intruders.

 

[Jc1119]

I'd add more cover ( wood, rocks, plants) I currently have 9 hood sized pieces in my 90 with SA cichlids and have no aggression issues for the most part. Sight breaks are the key

 

[id10t]

If you can't add more gallons, then add more cover.