Kribensis cave questions

[Murf.]

This is my first experience with Kribs. I have a male and female I believe are paired. They followed each other around in the tank at LFS and did these little dances around each other.
I see where people say that their caves need to have only one way in and out.
The closest to a cave structure I have is an alien skull - two big eye holes and a large hole in the back of the head. I have only had the Kribs 24 hours and they are currently hanging out in the skull.
My questions:

- is it important for there to be only be one entrance/exit in cave.

- If I need to buy a one-hole cave, I saw these 2 sizes:
X-Small: 2 in x 2.75 in x 1.75 in
Small: 3 in x 5 in x 3 in
Which would be best for a pair of Kribs?
(I'm thinking the x-small would be too little)

- If they already put eggs in the skull, I would not want to disturb them. Where would I look for eggs? Top, bottom, where?

Thanks

 

[itiwhetu]

Don't look for the eggs, most important that if any Cichlid lays eggs you don't disturb them. If they are happy in the skull great. I used to use Terracotta pots cut in half they work really well, give them different sized houses they will choose the one they like.