Board Thread:General Discussion/@comment-6050823-20131209045547/@comment-8874090-20131210181156

Someone here once had a theory I liked, so I'll say it (note: this is not my theory, I'm merely repeating it):

The normal lagi is just, well, normal.

The Ivory one spends more time on the shore, meaning it's more exposed to sunlight, so it could soak it up and become a lighter color.

The exact opposite, abbysal, is nearly never exposed to light, meaning it doesn't soak up any at all and turns dark.

So the normal one is in between, soaking a middle amount and being regular coloured.

This seems fairly likely to me, though it doesn't explain the strenght differences.