You may be getting more than you bargain for by keeping a pair of bocourti in a 125 (assuming you can find a compatible pair, even by growing out a small group).  They max out at around 35cm and are more feisty than pearsei.  I have a bocourti in each of two 210 gallon mixed CA communities.  Both are around 5 inches, and they regularly challenge others in the tank.  Their aggression so far hasn't resulted in any noteworthy damage, but that may come as they increase in size.  I agree that C. nanoluteus are too small and peaceful to put in the same tank.  Perhaps Archocentrus centrarchus, Honduran redpoints, or firemouths?








				
			







	
	

