What do you need for a nano?

[BC_Grl]

I know what I need for the 90g and lighting was easy with the 2 Radiums, so I didn't have to be limited of livestock... I am thinking of getting either a 20 or 30 g tank.

What kind of lighting do you use? Do I have to get Power Compacts? I will keep my Frogspawn, Kenya tree (and hopefully my brain can go in there, but have to check out its lighting needs) in there.
What do you use for filtration? Obviously a sump is out of question... But can I use an Aquaclear for S/W?

Please don't laugh at me. I am finding it hard to small-scale things once you've been used to a larger scale (well, not as large of Jon's new tank ). I would imagine I could keep a blenny and maybe a couple of small fish?