I have two green severums about 4 inches each in a 55 with 2 meeki, 2 finfoil barbs and a royal pleco. Is this a mating thing or aggression? I was leaning more towards agression because I dont know what age severums have to be at before they start breeding. If someone could shed some light on this for me that would be great. If I can get a quick picture or video I will upload it.