Hrmz, yes...you can put Rowa in your cannister filter, thats what im doing now, the down point is that using rowa in a cannister will never be as good as running it in a dedicated FR. If your tank has the space, i'll seriously recommand you to get 1, its a good piece of equipment. Check the pasar malam section, think i saw 1 reefer selling his for aroung $50 with some media as well, good steal.