Your bristlenose is acting that way for a few reasons.
No bogwood to munch on (need that for digestion)
no hiding spots or caves
I would also suggest you feed the fish a lot less, there is too much food.
He is going pschyco to protect the food too, so I would suggest that you put a piece of food tablet on the one side of the tank, wait for him to start munching and then put another one on the other side of the tank.
He will need some greens, I could not see an algae wafer or veggie for him, that would calm him down too as the others won't try and steal that from his since they eat the other foods.
And I think he is a she, I can't see any obvious bristles, but he might still be too young, can't judge his size from the video
ps after watching the video a second time, I sort of judged the size of your tank and will not suggest you have another bristlenose in there as well, they get up to 15cm and have quite big terrotiries (sp) so your tank is a bit on the small side for floor terrotiry (sp)