Once again I'm having problems with my sorority. I separated a female recently because she all of a sudden was just getting way too aggressive towards the others, in turn causing a lot of fighting amongst the few. I had determined this was caused by a frog i recently attained(which i immediately removed, to no avail ceasefishfire)
After the separation of the fish, the 5 rest were doing fine till about 4-5days in when (one of)my most calm fish started getting nearly as aggressive as the other was, outright attack mode. I figure it may just be like a reestablishing of the pecking order, but it looks serious as there wasnt ever this much tension.
I had noticed however that the fish i separated has been getting a new strip of black color along the edges of her fins. Is this maturity, and the aggression a the result? I've also had the other fish for the same period of time, assuming the same age