Shadow Eyes can be founded majority of levels with darkness but they are common on Level 2, 6, 8, 9, 34, danger zone on level 37, and rarely on Level !.
It's really really big and it has 3 Bacteria monsters in or 1 I'm not sure. I'm re-creating every (most) level (s) and Sub-Levels And sub layers in Minecraft lol and I just did all the sublayers of level 0 + the level.