i am concidering buying a convict ciclid and dont really know much about them, it is about 3" in the shop how big do they get and are they gonna kill my gar? I have a paroon catfish but i think im going to return it as i was miss sold it. (they told me it was a hi fin silver catfish but i cant find anything about this fish) and it looks exactly like a paroon. Any info would be appreciated. The gar is a 3-4" spotted gar.