Ok guys, so you can officially add me to the moss ball army!! Lol! I picked one up today. It's about the size of a golf ball. They had bigger ones but now that I take a second look, they aren't very healthy! I saw this one that was fluffy and dark green, but smaller. I just had to get it. So I named it Marvin and I just put in my tank after a water change. I'm acclimating my betta right now so well see what happens! Thanks for all the care advice!