I have a Mandarin in quarantine right now that is eating Frozen and flake food. This is my fourth attempt. The others did not fair well.
A couple things to consider:
Are you in a position to feed them frozen 4 times per day or more during the light cycle? Mandarins are use to grazing throughout the day and eat thousands of pods per week.
Do you have a sizeable sump to maintain a stable amount of pods to subsidize the frozen feedings?
I saw in your other post that you are talking about a 30 gallon tank. I'd wait until you upgrade your tank and have it running for a year. It takes a long time for pods to build up breeding capacity.
Do you have any wrasses or other quick fish that will outcompete the Mandarin for pods? The mandarins are beautiful, but their fins seem more decorative than functional.
I'd recommend starting with one, not the two that you discussed in your other post.
What are you going to do when you go out of town?
My $.02