check this one

[rasdbo]

any pics of a weeksi, "zaire green" or congo, and whatabout a buttekoie, may not have spelled them right but all are bichirs and would like to know max sizes, how to tell male vs. female, and what are the different color variations?

either way it goes AWESOME LOOKING FISH

 

[Kenta]

Zaire green

buettikoferi

 

[neoprodigy]

wow nice bichirs...

 

[gubbz316]

Good looking fish

 

[Kenta]

forgot to answer the second part of the question
weeksi max - 20" ish, largest i've seen is CDMs 19"er
Z-green - i think 20" as well , the one in the pic is around 12" and is also on the plainer side when it comes to pattern
buettikoferi - ~12"

Males have a wider anal fin, you'll notice that as they get larger they will "cup" them sometimes. Females have a less muscly anal fin, its much easier to sex them once they are 8"+.
As for color variation, there are 3 palmas subspecies, palmas palmas and palmas buettokoferi are very similar looking, very hard to tell apart. Palmas polli is quite easy to distinguish from the other two. Other than that you can vary their colors using lighting and substrate color

 

[Taz2478]

the ZG looks sleeker than the buetti

since bichir are peaceful, think they would mix as long they the same size?

 

[Infblue]

yes they would mix as long as size difference aren't too great

 

[Kenta]

It all depends on teh individual temperment of the fish. Most often it will work, but sometimes you will get a maniac that doesn't like other bichirs. I had an endi i had to sell because all it would do is harass the other bichirs, always tearing and taking chunks out of fins.

 

[Taz2478]

figured that too, you never know til they in the tank

 

[Infblue]

street cypher made a good point. every once in a while you might get a maniac that won't get along no matter what, but most of the time you'd be ok. also i find as the number of bichir increase its more likely they will mix well, though this won't necessarily help if one individual out of the group is a maniac but for mildly aggressive ones this is sometimes a good strategy, provided you have enough tank space