Hi and welcome to the TRT. I have a 20 gal long nano reef.
Right now i have .......
one 1.5" to 2"
maroon clown,
one 2.5" to 3" lawnmower blenny,
one 2" bi-color blenny,
one long tentical anemone,
one urchin,
one 1.5" sea hare,
6 or 7
nerite snails,
5 nassorus snails,
one turbo snail.
I used to have two medium sides sandsifting stars but one looked as if he got a bite taken out of him and never recovered and the other died when i took down the 20 gal to drill it and he never made it back into the 20 gal.
I am looking into gett some kind of shrimp soon. don't know what kind though.