Well first signs of aggression are coming through, I havent witnessed any yet but two have small nips to top fin, two have face wounds (one is old, one is new) and there are also small wounds such as odd scale here and there. Will try and spend as much time as can with them but with work can only hope to witness if pair form and remove the others before death (fingers crossed). 5 out of 6 always come out and snuggle about except when food hits the water (blooming piranhas!), the 6th comes out eventually but usually slower and shyer than others.