you need to tell her the tang is probably so unhappy in the 10 gallon and put her in a closet and say he gotta enough room that's how your tang feel's. P.S. dont put her in the closet just was joking lol
her closet is already overstocked. but she could occupy herself easily in there.
OH! i almost forgot the original question. how do make a saltwater change? im imagining alot of hassle and DOmeters and salinity test kit and a load of hassle.