I too have a mandarin who will accept Formula One & Formula Two pellets, frozen brine, live brine, & frozen bloodworms...he grabs what has sunk to the bottom. If your mandarin will take pellets, perhaps try what I do...When I feed the tank, I put some pellets in just for Mandarin...the pellets sink immediately so while the other fish are busy swimming around eating the frozen mix, Mandarin can eat in peace. The bloodworms also sink quickly, and only our Foxface is a "bottom picker", so the Mandarin usually has plenty to choose from.
It is true that Mandarin will become more "aggressive" during feeding time. He will now come out of the rockwork & wait in the one spot where the food hits the sand first every time...he knows where the food comes from!
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Our Mandarin is about 4 inches from mouth to tail & we restock the pod population every few months with about 4 bottles of Aquapods or a similar product. Not cheap, but I never feel like we have TOO many pods, so I just get some whenever I order something else live online for the tank.
And I agree with the comment about Mandarins being perhaps easier to keep than some people are led to believe. Of course, PLENTY of live rock is essential to their survival, and the majority of Mandarins will not accept any prepared foods...but if you have a sufficient pod population, have the funds to replenish the population frequently if needed, & find a healthy specimin, then you should be good to go.