Alright. I will make some guesses. The pictures arent the best quality, so im not 100% sure on some of them.
1-
Maylandia callainos http://www.malawimayhem.com/profile_show.php?id=308
2-
Maylandia lombardoi (male) also known as "kenyi"
http://www.malawimayhem.com/profile_show.php?id=399
3-
Nimbochromis livingstoni http://www.malawimayhem.com/profile_show.php?id=371
4- Same as #2, male kenyi
5- Pleco, gold nugget??
6-
Melanochromis chipokae - not an auratus, but a chipokae. This one is a female, or could be a young male.
http://www.malawimayhem.com/profile_show.php?id=286
7- Same as #6, chipokae
8-
Melanochromis chipokae - Looks like a male chipokae, but is hard to tell by the angle of the pic. A picture straight to the side should help make a positive ID. I put my money on chipokae though.
http://www.malawimayhem.com/profile_show.php?id=286
9- Same as #8, male chipokae
10- Same as #6, female or juvi male chipokae
11-
Labidochromis caeruleus - AKA "yellow lab" or "electric yellow"
http://www.malawimayhem.com/profile_show.php?id=247
12- Rope fish
13- Pleco
14- Albino Pleco???
15-
Melanochromis auratus - Now this one looks like a female auratus. You might want to give this one back because she might be picked on by the chipokae males, or even breed with them producing hybrids.
http://www.malawimayhem.com/profile_show.php?id=284
16- Same as #1, callainos
17-
Maylandia estherae - "Red Zebra" Very hard to tell by the picture but i would guess a red zebra. A body shot would help ID it.
http://www.malawimayhem.com/profile_show.php?id=278
18- Same as #11, yellow lab.
Whew, well those are them to the best of my knowledge. Have a look at the links and see if they match (you know your fish best).
HTH

-Diana