The protein skimmer was $140.Ive tried the fission nano (not worth the box it was delivered in).I tried the oceanic skimmer(better than the fission nano by far,but it is cheaply built,the SR3 is the rats a$$ . It takes up the whole middle chamber and is worth every penny and them some. It does what it says it is going to do.There is so much skimmate in the collection cup. I would recommend this skimmer for any BC29 owner because it is designed specifically for it. 5 out of 5 stars. A little pricey , but you know the saying, you get what you pay for.