Goldie Zlac

I would like to see a purely aquatic race(s), even if only minors. Perhaps it would be cool if you wouldn't even know they are there and settle on the same planet and only find out about them when you research specific tech or when you get attacked by flying killer dolphins! Maybe ideal temperature/gravity/pressure/atmosphere/whatever...:D Settle on the same planet as someone else (mybe pre-historic minor race?) and start terraforming (and slowly killing them in the proces