Yeah, wrasses have a bad reputation for jumping, especially when kept with bully tankmates. We put about 6 different wrasses in our 180store display reef over the last 8 months and one by one they were chased out of the tank vertically by our two watanabe angels. And I have found fairy wrasses living in the sump of our store for over two months! And yes, they will be able to fit thru egg crates.