Hi guys, I've just added some rock to my aquarium, and was wondering if I need to do some redesigning. I kind've have it in the middle of the tank with space behind and in front of the rock but I'm thinking I should have the rock pressed against the back wall so it can be a hiding place with only 1 entry point for the fish who need hiding spaces. Is this correct or is it fine having 2 entry points in the crevices?