I own the hqi system myself and bought the tunze and ran it for a few weeks it then became a headache instead of help. don't bother with a skimmer just a 5 gallon water change a week or biweekly is all you need, coral will thank u and so will your fish and I have a heavy bioload. 5 fish, shrimp, crabs, star fish etc... 1" of fish per 5gallons of water biocube 29 has 20gallons not 29 so u can see I'm over my load easily but the water changes are working out perfectly. no stress at all from nitrates not even close it's always barely noticeable when testing can't even see it on the scale.