Tail looks a bit shredded. Maybe the other vatf.
Did you figure this out? I've had semi aggressive flagtails before but they never caused damage to a tail like that, more just a chase here and there. Without knowing the personality of the duriventre I'd keep my eye on them.
Hi I've had a flagtail keep all my spotted silver dollars pushed up into one corner and not let em out but the only real damage they can cause is through stress I think which is why I removed mine too, as has been said prob the tig and then maybe silver dollars picking at the already damaged finNope not yet but the duriventre and flagtail were moved to a diff tank so guess we will see if its the tig .....