You can have a yellow watchman (if that is what you meant) and a pistol shrimp. Neither produces much waste. You could also go with clown gobies, firefish (needs lid for sure) a possum wrasse, neon blue goby, or pearl jawfish (needs a lid for sure though). Obviously those aren't all the fish and you should really only have maybe 3 in that tank but still).
BTW that light is weaker than the stock and will probably not be able to grow much coral at all.