On top of the cool plants listed above, I would add Marimo Ball and Aponogeton into good plants to research. Sometimes Bettas will turn Marimo balls into toys. Aponogeton is avaliable everywhere and even though it's hard to get started (only about 1/3rd of the bulbs will grow), once it does it grows like a weed! And it's good for making massive bubble nests :)
Also, don't forget a fert. I have a bottle (made by API) of the liquid and it lasts a LONG time! I just put it in with my pwc water every week before I add it to the tank.
Btw, my substrate is PFS. It's fine enough for the plants to make a good root system in, but not enough to compact. It works with my snail and shrimp. It just wont work with Corys, Loaches, and such.
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Last edited by Bluewind; 05-14-2013 at 12:49 AM.