Putting plenty of LR
and some Macro's for filtration and habitation area, along w/ regular feedings of LIVE phytoplankton should get a good pod population going in the 10 gal
. The addition of live phytoplankton will really make a difference. I would also feed the main tank live phyto to help keep the pod population as high as possible in there also.
Edit- I looked at your info and I feel I should point out Mandarins are not recommended for smaller tanks. They should be kept in large systems w/ at least 100 lbs of LR
to properly fulfill their long term dietary needs.