The UV bulbs need to be replaced when the LED light turns off on your monitor box, or at approximately 2000hrs of usage. The replacement is self contained; replace the entire black chamber of the unit. DO NOT open when the unit is on, or after use. Fits both the AA Aquariums GKM 24W UV Unit and the Blue Planet UView 24W. Reviews There are no reviews yet. Be the first to review “AA Aquarium GKM & Blue Planet UView – UV Tube 24W” Cancel replyYour email address will not be published. Required fields are marked *Your rating * Rate… Perfect Good Average Not that bad Very poor Your review *Name * Email * Save my name, email, and website in this browser for the next time I comment.