Foam Rock Wall Question about CUC

[ReeferBob]

I am building a foam and egg crate rock wall for my 72" 120 in-wall build. I will have a screen top but am still concerned about the CUC - hermits and snails - getting out. Does anyone have this issue and have you solved it?

 

[SeahorseKeeper]

I have a foam rock wall and don't have any issues. As long as the wall is in the tank, not sticking out and the screen top goes over the tank, there should be no issue.