We originally set up this 20 gallon tank for platy fry, and we started tossing plant clippings in there from our other tanks. There are no light bulbs over it--it's in front of a window and just gets natural light. As you can see, the java moss is out of control. It's kind of a mess in there, but the betta loves it. We've had him now for about a month, so I wanted to post some pics of him and his jungle 
He loves getting tangled up in his plants:





He loves getting tangled up in his plants:

