I sucessfully kept a clown, small blue tang and lawnmower blennie, with 2 shrimp, crabs, snails and a sand sifting star in a 10 gal for over 6 months till I upgraded to my 35 hex which will soon move into the 72 bow front I have started. Just get a good skimmer and if you have the lighting grow some xenia as it will consume nutrients. DO YOUR WEEKLY WATER CHANGE, I did 2 gal a week.