LiveAquaria is a great place to get started researching.....
Be aware that the coral banded shrimps are known for their aggressiveness as they get older.... in larger tanks, they're not as bad because they have some room to establish territory, but in a 30, you may have later issues.
Originally Posted by Daniel Fishy
Fairy wrasses, gobies or dotty backs are a few choices.
Most types of fairy wrasse I know of require much larger tanks than a 30.
There are a lot of gobies that would do well.
Many different types of dottybacks..... an orchid is fairly peaceful, whereas a neon is known for attacking ornamental shrimp.
As far as my
favorites that would work for you.... six-line wrasse, ocellaris clown, orchid dottyback, yellow watchman goby.