We tried the Cheato in the back of my wife's nano, it was a destritus collector. Then again i'm not saying what other people are doing is wrong, it just did not work in our tank. The flow in the back of the nano just seemed like it was'nt enough to stop the destritus from collecting. Ever since we added the Pura Complete the tank has looked great. I'm not an expert on this hobby i just try to pass on what i have learned from other hobbiest.