algae in my nano

[axe_man16]

my 20g has been up for 3.5 weeks and there is a bit of green hair algae(think thats what its called) i let it grow on the back glass, but it is now on the sand. i have 10 hermits which don't seem to be eating it.

i'm heading to a LFS 2mara what would be the best to put in there to stop the growth? turbo snails, more hermits, maybe a star? Just thought id ask before i go
thanks