Even if the hermits do go to work on the algae, they probably won't be a long term solution. They usually kill each other off till there are an ineffectual few left. Then the algae just comes back.
I've never had an urchin but if it has a taste for algae, it is probably a better long term solution. Maybe plan for one or more herbivore fish to be added down the road.
Also keep in mind that your tank is relatively new. Several months from now it will have stabilized more and you will have a better idea of how much algae it will grow and you can change your approach accordingly (more skimming, refugium w/macro algae, new critters, etc)
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