I was thinking of trying to breed synodontis petrocola, I was over a fellow OCA members house and he had two flower pots put top to top with hole for the cat fish to get in and marbles on the inside. I saw a design online and decided to take a shot.
I plan on putting a pot upside down on top of this container, my only question is do I add more marbles? To me if I add more marbles, how will the eggs fall to the bottom of the container?
What have you guys used in the past?