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Just picked up a Biocube 29 and primarily want to make it a reef tank and want to hear what the best filtration mods are. I know a lot of people are ditching the bioballs. I'm planning on using live sand with about 20 pounds of live rock.
I have the same aquarium. I went to mediabaskets.com. They show you what to get, how it works, and how to make the modification. Check it out. I like mine.