My filter socks are filling up in about 4 days. The water is mostly clear at night but when my AI sols ramp up you can see the particles build. I dose prodibio bioptim and biodigest every two weeks. I have stayed away from bio pellets after having an issue with hydrogen sulfide. Carbon isn't good for my tangs which in the past has caused HLLE and killed them off. My only other option I can think of is filter floss in the sump baffles. I'm leaving town in the morning and I can post a pic on Tuesday. As far as tank flow...well two MP40's and an MP10 running at about 50% on a 120 gallon. The only other concern I have has is the return flow. I run an ehiem 1262. That should be about 600-700gph said:
The problem you saw with using BP's., is that you probably had no way to regulate the flow to the tank. A BP reactor needs to have independent control of flow to/from tank, and within the reactor chamber itself. This will ensure that once your nitrates are down where you need them to be, you can slow down/cut off the flow to the tank. Reef Dynamics has an excellent unit, or you can make one yourself if you are handy with pvc plumbing.