...can you translate for the yanks here? What is the water capacity of an RR94?
Nassarius snails are good for the sand bed. As for the algae on the glass, Ceriths and Nerites will do a good job.
To give you an idea on number, in my 14G I have 4 Nerites, 15 Ceriths and 3 Nassarius. I also have 1 scarlet legged hermit and 6 Blue leg hermits. If you want to take a look at their cleaning
, I have pics up on my thread in Nano Reefs under 14G Biocube Reset.