Photo help - Proper colour - Canon SLR

[Coasting]

Im kinda aiming for photos that look as if you were looking right at the coral, but at the same time, having a few overly flashy ones wouldn't hurt, but my goal for now is true colour.

I just dont know what one is best representing the coral as each photo thats close is still slightly different. I think it will take a lot of playing around.
I may up the 4 slightly but not all the way, takes away from the grey.
I get less grey/truer colour with a lower ISO, but their too dark, 1000-2000 seems okay... ah I dont know.

Now if only the fish would stay still long enough to get their picture taken.

None of the recent potm themes have applied to me haha.