Invert only tank

[Plauri55]

Let me preface this by saying that 6 weeks ago my 13.5 gallon Fluval tank crashed. I believe I had a bacterial bloom that killed my 3 fish, tuxedo urchin and most hermit crabs overnight. I immediately put my live rock into my quarantine tank. The rocks were covered with mushrooms, ricordea, Xenia, Zoas, GSP and a Kenya tree. There were also a Duncan, candy cane and a hammer. While that was all in QT I cleaned out the tank, put in new live sand and ran it for a few days. Then put the rocks and coral back in. Only loss of corals were a couple of Xenia clusters and the Kenya tree. Within a few days all the Corals were looking great, in fact better than they ever did. Many are already adding new polyps and growing quickly.
Needless to say I'm hesitant to put new fish in yet. Actually thinking of making this a strictly invert tank.
So this brings me to my question (finally).
I'm looking for ideas for a compatible group of inverts that would do well in a 13 gallon tank and that of course won't bother the Corals. A mix of crabs, shrimp or two, urchin, etc.
Open to all ideas and suggestions.
Thanks!

 

[JasonK84]

Sexy shrimp, Pom Pom crabs.

 

[dbraun15]

In a tank of that size, I'd look into a bunch of sexy shrimp. In a large tank, they can get lost. I also don't think that cleaner/fire shrimp would bother the sexy shrimp, but don't have any experience there. If I remember correctly, the only shrimp that is pretty common that would mess with others is the coral banded shrimp. Looking good!