For the money it’s hard to beat a Phosban Reactor 150 from Two Little Fishes. I have one running NPX Bioplastics, and it keeps my phosphate and nitrate levels so low that my test kits can’t even detect them. And I haven’t needed to do any kind of water change in over a month!
One piece of advice if anyone decides to use bioplastics, though. Add them slowly, a little at a time. I added them all at once and got a major bacteria bloom that lasted about 4-5 days and killed my sand-sifting sea star.
I’m thinking about adding a second level of media to my reactor, too, and running Chemi Pure Elite in the top part of the reactor, separate from the bioplastics that are in the bottom. I’m still researching to be sure this is a good idea.