Male Mbamba?

[Steve]

A few weeks ago I lost my large male lab Mbamba which left me with 3 Mbamba which I "thought" were supposed to be all females, or at least they were sold to me that way when I bought them. Now over the past couple weeks that the dominate large male I had is gone I have noticed what I thought was the large female is taking on some nicer blue colors every week. Is this actually a male and just was not colored up because he was not the dom male of the species in the tank, but now that he has moved up in rank he's starting to show his colors maybe?

[Regalblue]

Could be, or it could be a dominant female. 

One of my confirmed females sometimes brightens up.

[Super Turtleman]

I would expect to see more yellow. Only time will tell...or venting.

[Steve]

I've been reading up on venting but I'm a little scared to do it because I never have tried and I don't want to stress the fish or worse yet drop it or something lol. Any tips on venting to share to make it easier for me?

[Ron]

Any tips on venting to share to make it easier for me?

The larger the fish, the easier venting can be. 

Also be sure to wet your hands before handling fish so you don't hurt their slime coat, though IIRC, you are probably already aware from all the fishing you've done.