I bought a male ancistrus and introduced it into my tank that already has a female ancistrus in it. The female has been very shy until now but since I introduced the male she has spent all her time chasing him VERY agressively around the tank. Should I have moved the bogwood and other tank decor when I introduced him so they could form their own territories?

It might be worth moving things around if the chasing continues.

How big are they?

Does the female allow the male to eat?

How big is the tank?

Do you have a specific breeding cave you intend them to use?

Things should settle as long as plenty of hiding places are available.

agreed with TopAz...should settle down but a bit more info wouldnt hurt

It's a 60 cm by 30 cm by 45cm high. It has plenty of plants and hiding spaces. Apart from the the two ancistrus there are half a dozen or so goldfish fry that I'm over wintering

Here's a video of the female. Is she in fact an Ancistrus? She was sold to me as a wild caught L150 in a very reputable aquarium shop

keep a eye on the female, sometime very rarely they just don't like the male or even set up...

I had a female like that and no matter what I tried it just would not calm her,
in the end I had to put her in a tank with more room and ensure no others were near her

good luck ...

bit hard to tell from the movie but it does look like a common bristlenose, but a better pic of the colouration would be better.

is she settling down?

Yes they seem to be settling down a bit now.