This so called has nothing to offer as the air stone in your biorb aquarium. Please go to your local pet store/mart and look for an alternative actually made from stone, if you got 9n the biorb aquarium hook. The biorb foam thing is useless. The stream gets killed in few months. The product prices incorrectly. Basically, they (biorb) trying to make you pay for foam, not the air stone.<br /><br />I replaced the air stone with the real compatible product and not only I'm happt, but also the fish is doing fine. Once again, aquariums are made for fish, not for wallets.