I've kept loads of BGK's over the years. They LURVE bloodworm!!
The thing that surprises me is that all you Americans say that they can be nasty, but in all the ones I've kept I've never known an aggressive one. They CAN hold thier own - they have big powerful mouths - but every one I've ever had has been peaceful. I've kept them with the smallest fish - even unguarded fry (e.g. guppies etc) and I've even seen them back off from food if there are fry near it !!!
Brown Ghosts - well they're completely different. Beautiful, but nasty little bad-tempered antisocial little nippy little bast*rds !!