Question on P. Terribilis new froglet

[Carisab]

I started my dart frog adventure with 4 tadpoles, our first froglet has arrived and now I'm worried. The tale was gone in 2/3 days. There is a very small nub. I have been reading up and I have been worried that it is not eating yet. I don't want to loose it. I thought it would take longer for the tale to be absorbed, so I ended up running around to try and find fruit flies. We only have two specialty stores that sell the different kind and they are both out saying they aren't sure when they will get more. I found D. Hydei at Petsmart and I put two in the container that she is in. A day later and they are still there. When should I worry? Are these too big of fly, I read that Terribilis can eat just about anything they can get in their mouth.

Any suggestions or advise??? She already has character, she tries to get out every time I open her container.