[magikof7]

I understand the need for QT BUT Mandarins have a very thick slime coat and are very resistant to disease. You might want to consider just putting him in your Display. Do some research on your own on that. I put my guy in my 29 gal right away because they can be hard to get to eat I figured the less stress the better and the chances of disease was very low.
Before anyone jumps all over me for not QT-ing fish. I do with all any new fish. I have some in qt right now but Mandarins are a little different. I did a lot of research before getting one and decided the chances of him dying in qt were higher than the risk of any disease.

I did reply on my tank build thread about my mandarin. I will copy and paste it here for others.

..."I didn't do anything to get my mandarin to eat frozen,(not intentionally anyway.) I don't feed frozen often nor did I need to because I had a crazy pod population in my fuge and DT of my other tank.

I can tell you what I think got him eating frozen...I turn off all flow, power heads and return pump. I fed the carnivore frozen cubes, brine shrimp and or blood worms Mixed together. I also fed frozen mysis shrimp. Because there was no flow the food sat on rocks, substrate, and Corals when the mandarin was over the food his fins would stir up the food and he would eat it when he saw it move. It also has to be very small pieces.
They are such slow hunters, I think the flow is just too much but you turn it off and he can hunt all he wants and his own fins make it move. It has to move and catch his attention but not so fast he can't "hunt" it.
I have seen others use a petrie dish with holes in it filled with store bought pods or frozen foods. Another method I have seen is a baby food jar with frozen food and small pellets, the mandarin can get in the jar but bigger fish can't."