I just got back into betta hobby after 3 years of retirement. However, in the past, I hardly ever cycled my tanks before placing fish in there, or at least I cycled them with the bettas in there and they seem super healthy the whole time lol. Especially fry's. I just set up my 55 gallon, dechlorinate it. Add a filter. Slowly acclimate the fry into the 55 gallon and voila. Healthy healthy healthy me, I eat fruits and vegetables that are good for me lol. However, I strongly recommend cycling your tanks. You would be doing the right thing.