So I drilled my 20 gallon and am ready to set it up tomorrow, but have a few lingering questions about a fish only system. Keeping in mind that the main reason for this tank is to act as a quarantine for new fish before they go into my reef with a secondary reason of holding a couple not reef safe fish... 1) Should I put any live sand in the 10 gallon refugium? How about chaeto? I would only do so for the filtration benefits, but would really prefer not to have any. 2) I've got white PVC for the drain pipe and some of it is visible in the tank. Can it be painted and if so, what kind of paint should I use? I'd like to make it plain old black. 3) How do you cycle a FO system? I know that should be a simple one but I am so used to thinking about a reef that I don't remember what to do!!! My goal is to have a very clean, modern looking system. No rock, no sand, no silly tank decorations (fake coral, etc...), no paint or shelf paper on the back. I want crystal clear water in a totally fish only tank so it looks like they are hovering in the room. I'll be running the water through a 100 micron filter sock setup in a 10 gallon refugium that will be hidden from sight. Also running in the fuge will be a uv sterilizer and carbon. Please help me by answering my questions. I promise to put up pictures tomorrow!