I have to leave unexpectedly for 8 days and I currently have ~180 week old hatchlings! I feel horrible asking my grandmother to culture BBS, but I do have frozen BBS. I'm wondering if I can switch them to the frozen BBS while I am gone for 8 days. I should have way fewer hatchlings by then, and they will be about 3 weeks old. What is the best way to switch them to frozen food at such a young age?