first get the blundergat from the box

in the dirty room on the 3rd floor there is a picture that says you need to find craig, press on it

then go to the next floor and press on the photo of the purple fish, it will tell you its fake

go to the room with all those fish in it, on the 7th floor at the end,

the real craig is in that room

the magma gat room will be opened in the hallway with obamas anime room