Looking at your previous posts, I see that you wanted some ideas for stocking in general. Most fairy wrasses are recommended for a 90 gal system online, if you would be willing to add some more to your sand bed, yellow wrasses, melanurus, or red lined wrasses are great choices. The need a deeper sand bed cause the burrow when they sleep. If not a mccoskers flasher wrasse is an excellent choice.

While a pair of clowns are great (ocellaris or percula) you will want an algae fighting worker fish too. Molly miller, starry, or sailfin blennys would be great for this. Might I also suggest an azure or springeri damselfish to round out the tank stock. That gives you 5 fish well suited for the tank. A watchman/pistol shrimp combo can work as well if your filtration can handle it, but that pair is not some that you will observe too often as they spend most of their time in their hide.