What is the easiest mop spawner to breed? (but saveable eggs)?

Question

mop spawner is a fish that spawns in mops

Answer 1

one made from dark green yarn. I have read that black makes it hard to find the eggs and so does white.

Answer 2

you're most likely talking about killifish

here is an article on how to spawn them

http://www.fishlesscycling.com/articles/...