Well, I have had many freshwater tanks when I was younger, with excellent results. I always used undergravel filters with power-heads, and I never had trouble. I always kept fewer fish than the tank would hold, and managed to keep everything very low maintenace.
I am very interested in maintaining a mini, nano-reef type of setup. My freind in california suggested the nano-cube 12 gallon with live rocks and live sand. It seems this is similar in concept to the fresh-water setups I have kept in the past. She claims to only have to do minor water changes every other week. I would like to attempt to use a plain old 30 gallon tank, and make the modifications to that tank that will allow me to keep a nano-reef. I would prefer a simple to maintain situation like my freind has with her nano-cube. I am assuming ( I know how dangerous assumption can be) that I could use a 30 gallon tank with excellent lighting and get at least similar results. Just maybe with a little more cushion for error on my part than the 12 gallon nano-cube would provide. I think my specific questions are..
1. Can I ( also should I) use an undergravel filter?
2. How would I use living rock and sand and a biological filter in the tank? (Would I use some type of external canister or something?)
3. With a 30 gallon tank, what sort of livestock could (should) I put in there?
4. Is it worth the trouble to try and convert a plain 30 gallon glass tank to a nano-reef, or should I spend the money and purchase maybe the nano-cube 24 gallon tank?
Here are some things I do understand, so we can get that out of the way.
1. I will have to cycle my tank for like a month before I can add anything other than living rock, and clean-up crew.
2. I require fancy shmancy lighting.
3. Hard coral are a pain, and soft corals are easier to keep.