Refugium questions

[reefgirl189]

Could I put a refugium into the final chamber (return chamber) of my sump? The return pump would be in there with the macroalgea, would this cause problems? Or would it be a better idea to make a hang on style one and place it over the return chamber? It would be easier for me (and by me I mean my wallet) to avoid the hang on style one.

Also is a 6500K bulb sufficient enough for this setup and how many hours of the day do you leave your light on in your refugium?

Thanks!