I bought some Apongeton bulbs today to add to the tank that I'm cycling. I thought they would really help absorb the ammonia and grow fast. I'm looking forward to watching them sprout! It was so cute when I put them in. Sir Lefty kept chasing them as they fell to the bottom, and nipped at the first one I put in. I also got some test strips, and my nitrite is 0 ppm, my nitrate is around 0-5ppm (stupid strips aren't very accurate), and my ammonia was a bit high, but I changed 25% of the water, and now it's 0ppm. Overall, I'm very happy with how things are going so far. I'm looking forward to getting a snail and some shrimp after the cycle is done.
:D I bought those bulbs, and all have sprouted, one even flowered for me and after a while the flower grew to a baby bulb. I let it be until the baby bulb started sprouting roots, then I snipped it off and planted it. Now I have 7. I found it's best when you just buy the bulbs to stick them in a cup of water with some fish food in it as a source of ammonia. They sprouted in a few days in the cup for me, and only one got moldy (I wiped off the mold and it did fine)
Since you are doing a fish in cycle, make sure do do about 50% weekly water changes to keep the toxins to a manageable level as not to hurt your betta.
It depends on the size of your tank. Mine is a 10 gallon with a lot of wisteria, a java fern and two growing aponogeton bulbs, and only one betta, so at the moment, I do a 20% water change once a week (though I don't need to seeing as the plants so far are taking care of all the ammonia/toxins). Smaller tanks without plants might need more.
Aponogeton doesn't absorb ammonia as fast as alot of other plants, but it is still a great plant. Generally faster growing plants absorb more ammonia than slower growing plants. Stem plants grow pretty fast (e.g. hornwort, wisteria, anacharis, etc) and absorb alot of nutrients, but they need some type lighting.
My aponogeton is finally starting to get big. I don't know what was wrong with it but I put it in my tank more than 7 months ago and it is just starting to mature. I think it had something to do with the Flourish I just started adding afew months back.