Copper vocano spawn slimelung quickly

(Sorry for my bad english)

As you see, my copper vocano made slimelung spawned so quick, instead of its high temperature when it erupting copper. Before erupting there are ~1,000-10,000 germs/cell but after erupting there are over 100 million germs per cell. I've try to fill that room by chlorine but germs continue spawning every eruption.

Acropolis Cycle 61.sav (1).sav