I bought the remora c HOB when I read up and everyone said it was he best around and would fit better. I have a coralife super skimmer and it is a HOB that is huge. The remora -c ran well at first but the microbubbles were way more than I expected and the small cup constantly needed to be emptied. It did not at the time have the drain fitting. I then boughtthe bubble difuser and it was garbage. Didn't do the trick and tok up so muchtank room. Big black ugly box in the tank. I went back to the super skimmer and even bought another one for my other tank and put it ini ts sump. At half the price it works better and is less maintenance.
I am trying the remora c one more time but on a smaller 30 gal I am trying for sea horses. I spent so much on that darn thing I need to make it work. 2 years of sitting on a shelf staring at me is driving me nuts.
My advice to you is stick to what works for you and don't worry about price. If you find something cheap online and it works - keep it. If not, try something else. Don't go for the more money means better stuff.