Identify these amazon fish...

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The cichlids in pictures 1 and 3 are severums, probably Heros efasciatus. There is also a pike cichlid (Crenicichla) in the 3rd picture.
 
First picture has a severum in the background, neon tetras, and red-eye tetras.

The second picture has rummy nose tetras.

The third has severums, and I think cardinal tetras, though they could be some interesting color of neon I haven't seen before.

The fourth I could have told you if you didn't ask. Its on the tip of my tongue. /anger
 
Nice photographs.

They're all Cardinal Tetra, and there aren't any Red-eye Tetra there. Too many Characins that aren't even in the aquarium hobby for me to tell. Highly doubtful the last shot is from the Rio Negro either so it's hard to narrow it down without knowing the species (which I've personally never seen before).
 
The red eye are way in the background. Look at the cardinal tetra, then look behind them. Below the tetra that's in the forefront of the picture and above the cardinal.
 
 
I agree with what others have said. The cichlids are severums and like what ryan said they are probably H. notatus, atleast in the third shot. The larger fish in the top left corner of the third photo is stumping me though, anyone have any idea on that one?
 
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