it depends on what type of media you want to use in the reactor.
If you want Phosphate media, then yes, im sure the mj400's fine.
If you want to use Nitrate Media, then no, i would use something stronger.
Phosphate media = Low flow
Nitrate Media = Optimal Flow
Or if you look at my picture above, you will see nitrate media on the bottom, and phosphate media on top. That will suffice with a optimal flow setting because the nitrate media breaks up the flow prior to it rising to the phosphate media...