If I had betta fry, jarred most and had the tank I'd put one in it xDD that's about it. mst fry are soooo weak for immune systems, such as guppy, molly and platy fry because they are ones who do better in cycled aquariums :) and cyclign a 2.5 is not recommended :p
Bettas are awesome xD why not right? :3 give in to the betta bug!!!