I have two of them in my 130 gal tank and they are great. I have my temp at approx 80 most of time. I anchor them to a rock on each end of the tank with a rubberband. They still break off and get long and thin looking but it takes serveral months for that to happen. They are pretty inexpensive here so if I get a good 6 months I can replace them. It is great for sucking out nitrates, nitrites and and ammonia.