As a long time keeper of Julidochromis species, I thought it might be helpful to share my experience with their preferences for cover, structure, etc. These are primarily rock dwelling cichlids, which do best when provided with plenty of cover. I have posted numerous times about strategies for enticing them to spawn in aquaria. In fact, all of these species will happily do so. Some species will spawn with little to no effort on your part. Some require a bit more assistance.
I believe the best way to determine what kind of cover they prefer is to provide them with multiple options and see where they stay most of the time. Though many julie species, as they’re colloquially referred to, will happily cruise any open spaces when comfortable, they will seek shelter from other tank occupants, including conspecifics, when spooked. But when they’re not out in the open, see where they hang out most. Many of the species are also quite particular about where they lay eggs.
I have found several species, especially regani and marlieri, prefer cave type structures with overhangs. Other species, like dickfeldi, are a bit less particular and will use whatever is provided. I have bred dickfeldi that prefer a simple rectangular ceramic cave and some that happily use the core of a stack of holey rock. At the end of the day, your julies will choose a breeding spot that is most ideal to them, based on their options.
I use any number of rocks, tiles, caves, ceramic pots, slate, and combinations to make things work.
