yer i would say if you get them get them in a pack of 10 to start with from babys as by the time they get big they would of eaten each other my mate started with 10 and now as 5 and they still only about half size and are hard to add new fish to the pack if you wanted to he had his lot in a 4ft fish tank and they seem ok
ive seen the vid of your ones my mates ones are no where near that size yet did you only get 3 from the start? my mate says by the time his are full size he hopes to have 3 left but nothing he does can seem to stop them killing and eating each other