Algae Grazing Fish For Nano

[intarsiabox]

Anyone have any ideas of what would be a good algae grazing fish for a 25g reef tank? I get this turf algae on my rocks that looks like mini ferns, there's not a lot of it but hermits and snails don't seem to be doing anything. The fish would have to eat prepared foods as well as there is not enough algae to sustain a fish. Currently have 2 clowns and a yellow watchman goby in the tank.
Thx