Crenicichla Lenticulata. (Atabapo) 9 to 10 inches.

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Vids are a bit short to tell for sure, but I know I see a female or two
 
The dorsal is the clearest way to tell. There will be a whitish band as the middle color and it will run all the way through the dorsal. The video where there's the two huddled together, its hard to tell but those might be your females and the big one is your male...Longer videos would make it easier to tell.
 
IMG_2637_zps69e6392f.jpg

IMG_2615_zps02d8e74c.jpg


Picture of all 3 is crappy but maybe blown up. Thet only meet in the middle to argue and are fast when they do meet. All look the same to me. I thought the larger one from the left was a cranky female.
http://i1051.photobucket.com/albums/s425/cichlidcircle/Pikes/IMG_2637_zps69e6392f.jpg
 
Found the article on sexing them on here with pics. I was concentrating on the anal fin. Thought it would be pointier in the male but at least I now know what to look for. Not sure if I will be able to tell yet but looking at the right fin is a start. LOL.. Talked about striations on the belly also but can't tell the difference on the pics he presented. Not easy to old eyes...
 
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