The grey aliens and the Hydrogen-Ocean (Hycean) planets are interesting topics for discussions about alien lifeforms.

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Can the grey color of the mysterious "Grey aliens" be the brains of the creature? 

Cosmobiology researchers have introduced that some intelligent aliens have their brains in the skin. The idea is that the grey skin of the mysterious alien creatures is the intelligent fungus. That means the brains of those aliens would be their skin.

There is one interesting theory about the "Grey aliens". The idea is that the "grey skin" of those creatures is the thinking part. Or the brains of that mysterious creature. In that vision, the grey skin would be the brains. That is interacting with a body that it uses.

So in this part of writing the idea is that "Grey skin aliens" are somehow true. Or even if they are not true they can give models for thinking what the intelligent alien creatures might look like. 

And the conclusion is that maybe there is the possibility that the alien creatures have thinking skins. The intelligent fungus is covering their bodies and controls them. The "grey aliens" are used as the model, what kind of intelligent alien creatures can have intelligent skins. But let's go to think about the primitive alien creatures, that might live in the oceans of giant water-covered planets. 

()https://en.wikipedia.org/wiki/Grey_alien

The Hycean planets can support life. 

The Hydrogen-Ocean or "Hycean planets" are giant, water-covered exoplanets with a thick hydrogen-based atmosphere. Some of those planets are orbiting their sun so close that they are locked. And the temperature on the dayside can be over 200 degrees celsius. The idea is that the ocean which depth can be hundreds of kilometers would not be so hot in depth. And the nightside will also decrease the temperature of the water. So maybe in those oceans is the living creatures. 

The clouds of steam that are rising from the oceans can decrease the temperature in the oceans. And the creatures that are living in those oceans are fully adapted to that environment. 

What kind of creatures those hypothetical and primitive alien species could be? Can they use photosynthesis or maybe the temperature of the extremely hot ocean for energy production?

The lifeforms can be algae or some other type of amoebas. There is the possibility that the algae are positioned to the bottom of the extremely deep ocean. And they might send the short-living cells to the surface. Those cells can produce oxygen and then they can store that oxygen in the vesicle that will fall back to the ocean for the food of that algae. The other version of these hypothetical lifeforms is algae or polyps. They have long tentacles that they will push to the surface of the ocean. 

The ends of those tentacles will burn, but they have enough time to create photosynthesis. Or those creatures might use the temperature of the hot ocean for making energy for them. Similar organisms have been met near "black smokers" at the bottom of the ocean on Earth. So why the hypothetical alien lifeform cannot benefit the temperature of the hot ocean as energy production? 

But when we are thinking about the form of the hypothetical alien creatures we must remember that we cannot close any possibility out before we are seeing those creatures. We know that the cells can resist high temperatures. One version is that the cell is covering itself by using slime. The slime isolates it from the hot water. Or maybe those cells are dividing so fast that the hot water cannot burn their genomes. 

()https://www.spaceflightinsider.com/space-flight-news/new-class-of-exoplanets-identified-in-search-for-extraterrestrial-life/

Image II()https://www.spaceflightinsider.com/space-flight-news/new-class-of-exoplanets-identified-in-search-for-extraterrestrial-life/

()https://kimmoswritings.blogspot.com/