Lily was my first female betta, I've had her a couple months, she was tiny when i got her, and she's still tiny. When I started my sorority a couple weeks ago, I picked up one of her sisters, Luna, whom I'd been eyeballing from the time I got Lily, so that she wouldn't be the only smaller girl in the tank. Since I got Luna she's almost doubled in size.. she started out slightly smaller than Lily, and now she's significantly larger than her. I always assumed I didn't notice Lily growing since I see her every day, but now to have another fish to compare her to, she really doesn't seem to be growing at all.. Does anyone know of anything that may cause her not to grow, or to grow slowly? She eats well, and her tank has always been very clean.. Any ideas?