yeah not sure with the exact setup your running but i know maintenance on my nano is bi-weekly cleaning of the foam pads the water passes through before the porceilin rings and carbon and bi-weekly changing of the carbon also i normally just rinse these in the bucket of water i drain off when i do the water change
has worked well for me so far _________ 
24G JBJ Nano, 20# Live Sand, 40# Live Rock
Rose BTA, Kenya Tree, Frogspawn, Xenia, Shrooms, Green Candy Cane, Duncans
Blue/Green Chromis, 2x Black & White Percs, Dragon Goby, Six Line Wrasse, Mandarin Dragonette
58G Oceanic, 60# LS, 60 LR, Lots of goodies 
Up and coming 90g stay tuned  |