Aleksei,
The person to get in touch with about the Pachypanchax from Madagascar is Roger Langton.
Roger has been maintaining various populations of P. omalonotus and P. sakaramyi as part of the Madagascar project. I know he has had a lot of success with them and also knows all about the various collections, populations, etc.
He also lives in your area and his address is as follows:
Roger Langton
556 W. Cedar Place
Louisville
Colorado 80027
Ph: (303) 673-0673
E-mail: RWLACN at aol.com
Roger is very interested in species conservation and I know he would be pleased to give you whatever assistance he could.
Regards,
Brian Watters
University of Regina
Regina, Sask. S4S 0A2
Canada
Ph: (306) 584-9161 (home)
(306) 585 4663 (work)
E-mail: bwatters at eagle.wbm.ca