I want to set up a small (10 to 20 gallon) biotope tank that is low - medium tech. Are there any good biotopes I could create for a small tank. I was looking at Amazon/South American, Indian, or African. Which biotope would be best for a small low - medium tech tank. I'm planning on about 2 - 2.5 watts per gallon with some fertilizers and diy C02. Also, any fish and plant suggestions to fit in a 10 t0 20 gallon tank.