I think the size of a Nano is up to the owner in reality. I consider my 25 a nano, but if you only have a 25 gal you might not concider it a nano. There is no difinitive size that makes a tank a nano but only guide lines and such. on this board we might say 20 gal or less on another board they might say 10 gal or less.
Nano's are usaly more of a chalange for good equipment (due to the lack of down sized reactors and good skimmers) but if they are small enuf there water quality can be controled by frequent water changes with out breaking the bank.
as for lighting you can do anything from NO lighting to MH lighting it all depends on what you want to do with your tank.
Steve
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 *everything said above is just my opinion, and may or may not reflect the views of this BBS, its Operators, and its Members. If cornered on any “opinion” I post I will totally deny having ever said this in a Court of Law…Unless I am the right one*
Some strive to be perfect.... I just strive.
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