Im setting up a new/transplanted 150g with a 40 gallon sump and 29 g refugium with baffles. I was hoping the current in the middle chamber of refugium would tumble Chaeto. Well yesterday i bought a bit, it wasent very much, maybe light baseball in size uncompressed. Put it in the refugium and to my surprise, it immediately started rolling in a circular motion...to the extent that it broke apart and most all of it went down and up the baffles, out of the refugium drain and into the pump area of sump, on to DT. Should i grown out more first? Start with a bigger denser piece? Reducing the flow will still have the Chaeto float over the baffel possibly but i do have a valve to reduce flow on refuge side, egg crate seems to open. Any thought would be great! Im going to need more Chaeto either way at this point...thanks for any and all help!