Oh sorry my tank is a 25 gallons and is a all in one tank so I don’t got a sump or anything or that sort. And I do 10 gallons water change every week with RODI water from my LFS, so I do the water changes to keep my nutrients up that my corals are using but my nitrates and phos went up because I did over feed when I got my new laffy taffy Goni and I wanted to see it eat and I would feed it reef roids every day for almost 5 days straight. After I saw what I have caused I did almost 90 percent water change and I added the small bag to keep those perimeters to what I had them before since it’s a small bag and not that much water flows through it. Because it’s not in a media reactor it’s just sitting in the back chambers of my AIO tank. And my last chamber where the water gets pushed out to the main tank has a crack on the back acrylic, that separate the main tank and the back chambers. So I know my filtration isn’t all that good so I though putting that small bag would help the filtration a bit more since I got a crack and water isn’t pushing through the bag like a media reactor