Peter,
A nice purchase from Kenya.
It is an undescribed species from eastern African coast. It was long thought to be a variant of C. rubriventralis.
The male has a single filament on D fin and female does not, and the ventral fins are very long and 'fat' like those seen in C. rubriventralis, C. joanallenae and also C. morrisoni (from Western Australia).
There might be two distinct species from the area; one from South African coast and another is your fish, but the former has not yet to be collected. The latter (Kenya) specimens were now deposited at Western Australian Museum and will be named by Gerry Allen if it proves to be a new species. I have kept over six specimens of males and females, and one of my males have shown a gorgeous display colors with a brilliant golden caudal fin.
The reply from Gerry has not yet been offered.