So I got a betta fry "baby betta" from Petco about two weeks ago. Right now it is in a 2 gallon plastic tank with no filter. It hasn't grown as far as I can tell. I was totally against Petco selling them, especially when I saw them. They all looked very sad and I'll. Since I've put him/her (unsexable) into its new home it has become very active and lively. It eats 2 times per day. I feed it betta bites, small bits of frozen blood worms, sometimes freeze dried blood worms, and flakes too. I do about a 25% water change each day and a full every three. Why isn't it growing?