Heres my question... I am running a 30 gal with LR and a skimmer. Now... I have 2 hang on whisper filters. I use them to run a denitrate and a dephosphate. Now People argue not to to use hang-ons because of the nitrate build up. But On the filter that I am running the de phosphate I change it every 2 days, remove it and thouroghly wash and rinse the whole filter, the same with the other filter running de nitrate but every 5-7 days. If I am washing these out thouroughly after every use is that enough to get rid of built up nites and phosphates?