I have a magnum 350 canister filter not being used. Right now I have the caulerpa in my display tank... it is getting everywhere and am enjoying the help with nitrates.... the algae is growing though because I have bumped up the time my light is on to prevent the caulerpa from going sexual. I guess what I want to know has anyone made their magnum 350 a refugium or what are your thoughts on this will it work?... I have an extra light I could keep in my stand with it and since it has clear sides I was hoping this might work.... I have no sump at the moment or I would do that and my cash flow I short right now let me know what u guys think.....