I have a DIY wet/dry with bioballs because I have a stingray and puffer which are feed very heavily with very messy food. I also have a emperiour 400, fluval 404, refugium with cheato and my nitrates are always between 30-60 ppm with weekly water changes, oh yea 80 lbs of live rock and a 4" deep sand bed, its a 125. So who knows what they are doing,but like everyone told me my trates will always be high!