I'm trying to make my own star system, and I would like to have an aquatic homeplanet. But the problem is that the planet still remains "habitable by all", although I put this line in the CustomPlanets file : TerrainPalette>Aquatic(the < at the beginning and the > at the end is missing, cause otherwise you could only read "aquatic").
Now it looks like an aqatic planet, but it isn't.
What else do I have to change, or is it not possible at all?