I keep a pair of onyx clowns, a blue tang (nickel in size), green banded goby, rbta and a few zoos/lps corals in my 10 gallon. As long as you have enough filtration and do enough water changes, it'll be fine. By the way also has 20lbs of LS and about 15-20 lbs of LR.
Here's a pic....
You can see all th fish in that pic. The green banded goby is in the lower right hand side of the pic. I run a penguin 200b and a nano aqua C remora skimmer for filtration.