Yes, German Blue Rams, being dwarf cichlids, have an inherent need for caves or similar shelter structures within the aquarium. These nooks offer them hiding spots where they can feel safe and secure. This need becomes even more prominent during breeding times, as Rams tend to be territorial and will appreciate a secluded spot to lay eggs.
You can provide caves through specifically designed aquarium decorations, or by strategically arranging rocks, plants, or driftwood to create natural hideaways. Keep in mind, while they appreciate the hideouts, German Blue Rams are also active swimmers, so ensure there’s enough open space for them to roam freely.