The only thing that worries me is that mandarins need a mature tank and this is because they need pods
...and I know the fish may be your main focus but that doesnt matter since the fish will need a lot of pods
to be able to survive and they don't come fast and supplemental feeding of store bought pods
wouldn't be enough because the mandarin would just eat them and then the pod population would be low again. If you really want a mandarin my opinion would to be wait some time to let your tank mature and grow a large pod population.