Hello, I am new to this forum and new to nanos as well. I had a 75 gallon FOWLR that my son absolutely loved. The storm :lighting came and went I was stuck in houston for 2 months and needless to say the tank turned into a cess-pool. Now everything is back in order my son is back home and i am starting him a nano. Now, after my sob story, on to the question. This will be a 10g FOWLR tank I have a skimmer on order, 12lbs of live rock, power head and i will hunt for some live sand tomorrow. What should i do with my HOB filter? Should I leave the carbon in or out? I've seen some post suggesting pieces of crushed live rock and some saying just use the filter as added circulation. I am so confused. Thanks in advance for your help.