Reef One Tube Guard is used to stop fish from getting into bubble tubes.

Some fish like to try and squeeze themselves into the most unlikely places.

Just in case one of your fish enjoys this behaviour Reef One have made a Tube Guard for the bubble tube for your aquarium to prevent fish from getting in while still allowing bubbles to get out.

Swimming down the bubble tube will not harm most fish, however if the fish is too large they may get trapped.