I have a 20g long currently housing 2 mated clown fish. The tank contains mainly green hairy mushrooms, green star polyp, and a few palys thrown in for good measure. There is a clown fish cave, some Roman ruins, and several hermits and snails running around. I have good coraline growth...a bit too good..it's all over the glass.
This tank is as easy as it gets as far as set up... I run 2 small HOB
(hang-on-back) filters and 2 Nano Koralias. No skimmer, no refugium. I use T5HO.
For water changes, this happens about once a week. Feeding-wise, a few flakes, a few pellets, pinch of mysis, pinch of Rods 2-3x a week. The clown fish are on a regular egg-laying schedule, but I don't do anything with them. Nature takes it's course in this tank.
Pictures to follow (lights were off when I went to take pics tonight).