The Dominion

[Iceman]

What do you think about an idea that the Changelings don't need any food?

The better start is a risk as the pop would go to the science facilities.
I think it could be rebalanced by a requirement of another building for the population grow. Something similar to the Maturation Chambers of the Borg, but with 3% of the growth rate for example.

I find it hard to justify the existence of a building that is only useful for a few turns in 2~4 colonies in a huge galaxy, TBH. It bothers me having buildings with limited usefulness, and we already have a couple of those, both universally available and civ specific. The AI needs to know how to handle them properly too, which is not easy.
Obviously, we could give the building a +Morale bonus, but the homesystem would be kind of strong from the start - with all the morale boosts from colonization. Not saying it would be OP though, just trying to cover every angle.

I guess that Building [growth + morale] could - actually should - be The Great Link, and it should be available from TL1; it always felt odd to me that TGL only becomes available at TL3 or whatever.
Maybe it should be spawned automatically when a Rogue planet is colonized - like the Borg.