Have got 2 male Bluethroats and have added today a female the dorsal fins are going up quite a lot is this a bad thing?

In Bluethroats, elevated dorsal fins can indicate excitement or stress, depending on the context. If the males are displaying prominently, it may be a sign of courtship behavior towards the female. However, if the aggression escalates or if there are signs of fighting, it could be a concern. Monitor their interactions closely to ensure the female isn't being harassed.