regarding filtration. I got rid of the stock filtration. Back chamber is all LR rubble (from my BC29), Return pump is Rio+ 90, and a heater (aqueon 20W). I do 90% WC weekly, religiously. If I find anything out of bound (zoas are not opening, or algae or anything dirty), I throw in a small amount of BRS carbon. Couple of months before I added an AquaClear 20 HoB filter. But I only use it thursday -> saturday, occasionally. I have an air pump hooked to. At times I use it, in-stead of the filtration (medications, chemiclean to cleanse the tank).