I had pearsei, zonatus and argentea together in a 150. Got all from Don Conkel as 2" youngsters, they were all fine until they reached about 6-8" when territorial disputes over spawning sites began to erupt, because there were enough of each for pairs to occur.
A 240 might work with few fish, but I believe you'd need to rearrange the decor and add them altogether as if new. At this point the argentea probably owns the tank, and any new arrival would be at a disadvantage.
A 240 might work with few fish, but I believe you'd need to rearrange the decor and add them altogether as if new. At this point the argentea probably owns the tank, and any new arrival would be at a disadvantage.