Attach it right — don't bury it!
Most important rule: The rhizome (the thick, horizontal stem) should never be buried in the substrate — that almost always leads to rot. Instead, tie the plant to rocks or driftwood with thread or cyanoacrylate gel glue until it attaches on its own.
Light and CO2
Anubias is one of the most undemanding aquarium plants around and does perfectly fine without additional CO2 injection. Strong light combined with poor circulation, however, can cause algae to settle on its slow-growing leaves — moderate lighting and good water movement help prevent this.
Care and common problems
Since Anubias grows very slowly, it rarely needs regular trimming. If the leaf color shifts from healthy green to pale or nearly colorless, that points to iron deficiency — a liquid fertilizer usually resolves this quickly.
Note for shrimp tanks: If trimming is needed, do it outside the tank — fresh cut surfaces can release oxalic acid, which can be harmful to shrimp.