Hey guys, I'm thinking of buying a moss ball for each of my four Bettas, but I'm not sure what the best kind is or what the most cost effective method of purchasing them would be. I know they have moss balls at my local Petsmart for $8 each, and the LFS I usually go to has big ones for $12.
I don't need huge ones, four smallish ones would be ideal for me right now, but what type should I get? And does anyone know where I can get them inexpensively that has good quality? I can order them online if I need to.