I just got a 240g tank and am setting up a filtration system for it, just had a few questions. I have decided to use pot scrubbers as the bio media and filter floss as a pre filter. Question is how many pot scrubbers do I need, I bought a dozen 6 packs (all they had), should I get more? The sump will be ~30g and the pump should flow just over 1000 gph at the head I will have it at. Another question is what size pluming should I use for this flow rate?