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While it is true that it is best to have established copepods, it is not true that pods are all they will eat. I have a green (psychedelic) in my 210g and a spotted (target) in my 110g and both eat frozen.I hope your LFS didn't encourage you to buy a Mandarin for a 4 month old tank. The fish is expert level fish due to its feeding requirements. They only eat live copepods for food. I been wanting to pull the trigger for a Mandarin but i'm waiting for my copepods to settle in and reproduce 1st.
Do you have air pump with an air stone? Oxygen in the tank may be low
Are you QTing him out of fear of introducing something to your DT? With mandarins I never QT as they have a heavy slime coat are are generally (no guarantee) parasite free. If you have an established reef I would acclimate and put him in there. Then dose (put in) all the pods at night when the lights are out so they can get into the rock without causing a feeding frenzy.Thank you. He finally moved when it got dark. He was well fed and looked after. Hope I can maintain that.