The SeeShelter brand betta tunnel provides a place for your fish to swim, exercise, and relax. Safe and Durable Our betta tunnels were designed with your fish’s safety in mind. The material is safe for both freshwater and saltwater aquariums. There are no sharp edges so there’s no need to worry about it hurting any of our long-finned friends. The strong suction cups make mounting and moving as easy as it gets. Super Simple to Clean Simply wipe down the tunnel and rinse off with warm water when you are cleaning out your tank. Never use soap, as the residual soap can harm your fish. Fun and Enriching! This simple addition to your aquarium will instantly add enjoyment for you and your fish! Small and medium fish (even a King Betta!) can easily fit inside, letting them swim in and around it. This helps reduce fish boredom and increase activity! Bettas LOVE it as well as many other fish and aquatic animals, too! Choose Your Color Not only is there a variety of colors, but a variety of transparencies, too. The rubber duck in the listing pictures will help you judge how much you can see through the tunnel, though he's not included. With so many options, you're sure to find the perfect match for your decor! Easy to Use Simply attach the tunnel to any clean side of the aquarium. If you have a bow front, try placing the tunnel vertically! Change up the tunnel placement! Different species have different preferences - for bettas, try starting with your tunnel up near the water line or even partially out of the water so they can grab a gulp of air. Cory Cats and loaches love their tunnels to be in the middle of the tank. Plecos and juvenile axolotls enjoy theirs at the bottom of the tank. After a water change, change up the color or placement of the tunnel to keep your fish engaged and interested. Have fun experimenting with your fish's preferred placement and color - fish can have favorite colors, too!