thanks!
they are in several different tanks but in each tank i do have a group of them. luckily i don't have aggression issue. Have you seen CDM's tank? he also has a group of bichirs without aggression, and he made an observation that i also agree. that is in general chances of aggression decreases as the number of bichirs in the group increases. and once you have a large enough group, there will essentially be zero aggression, provided you are lucky enough and don't end up with a super-aggressive psycho maniac individual.
michael: yes that bichir does have a lot of green on it, and the green become very noticeable when viewed from the right angle under direct light.
