I think Dr. Ian Malcolm said it best: "I'm simply saying that life, uh... finds a way."
cough. :lol: which is to say that they'll get by without. My Bolivians usually spawn on the smooth rocks I've given them, however recently I've found them guarding a pit of wrigglers when I never saw any eggs. All of my rocks in that tank were in plain view and I was checking them regularly because I'd seen them in breeding colours which means they spawned on something else (possibly driftwood) less smooth because it was better hidden than the rocks they'd used many times before. They might just be getting ready to use the anubias if that's where they've been digging. Anyway if you can easily provide them with a smooth rock they'll appreciate it, if not they'll manage with what they've got.
cough. :lol: which is to say that they'll get by without. My Bolivians usually spawn on the smooth rocks I've given them, however recently I've found them guarding a pit of wrigglers when I never saw any eggs. All of my rocks in that tank were in plain view and I was checking them regularly because I'd seen them in breeding colours which means they spawned on something else (possibly driftwood) less smooth because it was better hidden than the rocks they'd used many times before. They might just be getting ready to use the anubias if that's where they've been digging. Anyway if you can easily provide them with a smooth rock they'll appreciate it, if not they'll manage with what they've got.