Thanks :) It is pretty easy to care for, I just dose daily ADA ferts and use the Fluval Spec's stock lighting for 8 - 10 hours a day (no co2/carbon, I'm afraid of killing the betta). And you've got some lovely tanks too!
It's definitely grown a little! : ) There's also a seller on ebay who will sell a nice bunch of Java Fern for around $5. I can find that link too if you'd like! My moss ball has probably grown between .25 and .5 inches since I bought it, but I haven't had it very long. I've had no problems!