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And not to overcomplicate things, but while strictly speaking I don't think you need to add extra biomedia in your back media chamber, it's never a bad idea. Many of us like to keep a little extra biomedia going to use to quickly setup and cycle a new tank, like, for example, a hospital tank when needed. Arguably, the *best* way to cycle any new tank would be to use precycled biomedia or live rock from an established system. Just a suggestion.I would add a few of the ceramic bio balls in the sump area, 2 would be plenty for that tank it would definilty improve your bio filtration