07-15-2014, 03:11 PM
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The red eyes are albinos, any other without are just white.
As for what determines the shade of their skin...I think that is also the genes and how strong they are in that fish. It COULD also depend on lighting, habitat and diet, as it does with a lot of fish/critters and their colors. Diet often plays a large part in colors....as an example: I have some swordtails who started out white, feeding them on a color enhancing, good diet has gained them a lot of orange or red coloring. This does not affect ALL of course, as many stayed white. But this could also have something to do with genes and age.
So other than the genes, all of that could play a small part in the shade of color, the largest I think being food and age, though could also be from the type though I doubt it since the same type of albino cory(I had some of the emerald gene that were albino, two were white, three were pink), can also be different shades. Sometimes as they age, they may get in, or try to get in, some pigment...which ultimately kills the albino-ism since that means they lack pigmentation.