Bio balls are another filtration method, no used by many people any more if they have LR.
You can use what you like, but maintenance things like foam are not always a good idea, personaly I think that my corals would like a second chance at the DT's I put in the tank and not filter it out with foam.
My recirc line had a 1" to 1/2" fixed reducer so that would keep the flow under control. I don't like to have valves that if adjusted could overflow the tank, safety against other and maybe my self. I have done dumb things before.
Lee
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Need more time for the tank... Break a leg!
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