to build a refugim think of it this way its nothing more than a tank with plants and stuff with a slow water movement draining into your tank or sump. u can use a tupperware container or acrilic tank that u can drill a overflow hole get creative i am sure u can come up with somthin
here is a link to another post has some good links u dont have to go crazy on lighting like some of these guys its nice but regular bulb light is ok for it <a href="https://www.saltwaterfish.com/cgi-bin/ultimatebb.cgi?ubb=get_topic&f=3&t=003849" target="_blank">https://www.saltwaterfish.com/cgi-bin/ultimatebb.cgi?ubb=get_topic&f=3&t=003849</a>