Hi M.
Without appearing to sound patronising, if you are able to address your water chemistry problems as per your introduction thread in the welcome section, I may be in a position to help. I don't have any Fundulopanchax gardneri sp or spp presently (as my interests lie in sml Rivulus sp.) but I can probably source some for you. I hope you understand why I am saying this, as it is in the interest of the fish.
I hope you understand my ethics.
Regards
BigC