If you had to stock a 125 with with aggressive cichlids or ones that could hold there own. what cichlid would it be, the only catch is every cichlid has to be 10 inches or smaller. Also do it in pairs if you can.
Didnt specify if looking for SA or AFR but Neolamprologus Tetracanthus from Tanganyikia is my favorite! Don't believe they get larger than 10" (mine didnt) in a 125g and they can hold their own w/anything. They used to be easier to find but are still available,Good luck