Planet growth is limited by how much Purification Units you have accumulated (Pu). Building the toxic item recyclers, purification towers, purification rockets, etc., as well as clearing goo zones will detoxify the planet.
As far as I can tell, this is placed as a limiter on preventing full Terraformation until you detox the map. And to stop interplanetary players from just plopping down a bunch of T5-T6 stations and calling it good. (you can't even place an Atmospheric Water Collector until 1 MPu)

I have cured the planet from all junk but cant do frogs, fish and put down animal thing even tho i have them. Some animals have started to spawn. Think i am on the last thing from animals to complite. Maby its the complite stage i need?

When you hover over the frogs and fish in the build menu do you see the note saying at what mpu they can be built ?

Ahhh understand now. The GPU is the Purification counter :).

引用自 cebban：

Ahhh understand now. The GPU is the Purification counter :).

Yeah, if you've been playing Toxic like any other planet, and ignoring the purification aspect, you're far behind where it should be. but, at 1.9TT, it shouldn't take much to get all the boosters for Pu index cranking.