Slicksters are stick together and then do not move.
If carbon dioxide reach them, the Slicksters in first picture do not know to produce crude oil,
but in the second picture, they (or maybe one of them) can produce crude oil.
Because i have expanded my colony way to fast(?), and chlorine have reach them before,
and then i put carbon dioxide back into the area.
I didn't find the right solution from the Internet.