Tank size is great, but I would personally wait 6 months to a year to be sure your pod population is up to snuff. There are flagtail pipes that will readily take frozen (like Janns pipes), but DFs are less likely to. In other words, you might get lucky and get one that will eat mysis or ova, but you cannot count on it and even if they do, you can't rely on them eating enough of it to sustain them.
Also, be mindful that many fish like wrasses and others will take a toll on pods too. What other fish would be in the tank?