i would not recomend running salt on anything less that a 25 gallon tank. saltwater fish are use to a very stable environment. in a 10 gallon tank you can drop a tear in the water and the slat content would go up(just joking) however i would at least go to a 25 gallon tank. its enough room in a 10 gallon for a short period but what happens when you have a problem with the water. the nitraes would soar and ammonia as from waste and feeding. what are your other alternatives. do you have a tank to put in him in