I would advise against putting more than one of any species in the same tank unless they are a mated pair, and mated pairs are generally expensive and hard to find. Even the gobies might fight with each other.
Personally, I would go with a Clown. Hawk, Basslet, and Dottyback combo, if you want semi-aggressive. That would be about your limit for a 30. Gobies, Firefish, and Fairy Wrasse are peaceful and might get bullied or out-competed for food. I've had good luck with the Splendid Dottyback. It doesn't seem as aggressive as some of the other Dottybacks, which can be real bullies.
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“It is better to keep your mouth closed and let people think you are a fool than to open it and remove all doubt. ~Mark Twain~”
Current Tank Info: 55 gal FOWLR w/15 gal above tank refugium, 10 gal nano FOWLR
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