I've never tried moving eggs, it's easier to catch the fish.
@ Janice, yes there are many shades of white (being a painter decorator I know just how many shades of a colour people contrive) I hope things are good at your end!
The pictures I have tells me the shade, it's the same shade every time for the species concerned. I.e. C. paleatus. This may differ across the genus.
Technically it's a light pastel grey, but it's white!
I've never known a female to lay eggs alone but I've always had a mixed group. Once separated I have never witnessed additional eggs in the Isolation tank.
As I understand it, the female receives milt in the T position, then produces eggs which are internally fertilised, these then get deposited around the tank, then she goes back for more milt and begins again. The male has to work hard for the female to accept his initial "invitation"
This I have observed countless times over the years but I will be conservative and say 60 times just to put a figure on it.
(I realise these are bronze)